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Submission 2 Darwinian Metaphors. Objects and Technical Systems in Evolutionary Perspectives Silvia Pizzocaro Abstract The set of man made artefacts and systems have been frequently observed in an evolutionary perspective. Natural sciences offer an uncommonly rich apparatus as a source for analogies to be applied to the domains of the artificial. The literature on the evolutionary analogy is rich. The genealogical perspective is recurrent. According to this perspective the evolution of the artificial is mainly the evolution of artefacts (or objects, or products). As a unit of evolution, the artefact may represent the unit of analysis of genealogies, whose variations (or mutations) may trace the pathways of morphological and functional developments. The population perspective - on its part - may be outlined as the perspective on competition and selection dynamics applied to technical systems at the large scale. The population (or ecological) perspective opens a systemic horizon that is absent in genealogical visions. While revisiting the notions of genetics of the industrial object, technical species, demography of objects, this paper outlines some more recent systemic perspectives. It will be assumed that no strict similarity has to be theorised between living organisms and artefacts, between natural and technical systems. Rather, it is more a matter of assuming that at the base of structurally similar systems that proceed by different rules, there may be general principles. The possible unity of thinking may not reside in wrong applications of evident rules (such as natural selection) to singular contexts (such as technological change), but rather in the search for more general rules of structure and change. The paper concludes that comparison of some phenomenological characteristics of natural systems with those of man made artefacts and systems might serve as a heuristics. Keywords: evolution, genealogies of artefacts, systems of artefacts as ecosystems. Introduction The most generalisable ideas on the analogy between biology and technology are recurrent in many disciplinary areas. Some of these studies are little known, as it is the case of the theoretical contributions to the concept of progress in living systems and technological systems (Urbanek 1988)1. Developments in the field of bionics - on the contrary - largely spread out2. The evolutionary theories of technological change, on the side of economics, encouraged approaches that invested as much the laws of technological change as the ways through which technological development leans on economic implications (Penrose 1952; Winter 1964; Nelson and Winter 1974, 1977, 1982; Di Bernardo and Rullani 1984; Saviotti and Metcalfe 1991; Faber and Proops 1990, 1992). In a position uncomfortably placed between the praxis of bionics and the formalisation of economic evolutionary theories, a further tradition of study lacking formal elegance as well as disciplinary autonomy - may go under the denomination of technological Darwinism. This denomination is not the indicator of the homogeneous nature of the theoretical contributions it gathers - quite heterogeneous indeed. Rather, it simply highlights a common approach that interprets the way artefacts and artificial3 systems evolve. A common methodology is the unifying ingredient for the above mentioned different approaches: a natural system (or organism, or structure, or process) is used to derive a model for interpretations to be extended to an artificial system (or artefact, or structure, or process). The model, or the interpretation, does not directly provide a resolutive pattern. Rather, it is more question of obtaining design-oriented patterns that may provide a frame to embed temptative analytical, conceptual or design solutions. Natural evolution, cultural evolution, technological evolution Why may we learn more (or differently) on man made products and systems by looking at natural systems evolution? Is the analogy just a non-sense? Some founding elements of the analogy between biological evolution and technological evolution should discourage - rather than encourage - any comparison. A sort of an intellectual trap, as in Gould (1980), the evolutionary metaphor may be often more harmful than useful: biological evolution is a bad model for any cultural change, due to basic motivations: (i) the rhythm of cultural evolution is incomparably faster than any biological change; 1 A first bio-technological approach was opened in the Thirties, with the studies of the German zoologist Franz (1935), introducing the term bio-technical progress to define those structural and functional improvements of organisms, which could be measured through their efficiency. The meaning of progress in living systems and technical systems was further investigated throughout the Seventies in the Soviet Union, producing studies (Zavadski 1970) on the essential similarities related to those tendencies towards growing complexity, autonomy, reliability, that both systems may share. 2 The simulation of vital processes and structures has motivated the approach resulting into operative programmes; in this case natural structures and processes are converted into models for design of the artificial (Yeang 1974; Pearce 1978). 3 As in Simon (1969, 6): “ ... you will have to understand me as using “artificial” in as neutral sense as possible, as meaning man-made as opposed to natural”. (ii) any cultural change is Lamarckian, as changes are acquired and transmitted directly to offspring. On the contrary, natural evolution is Darwinian, the favourable changes being transmitted to offspring only if originated from genetic changes; (iii) biological evolution is a process of constant divergence: once a change has appeared, mutation or variation, evolution is irreversibly at work. Also the tree of culture may diverge, but it also converges, any change being reversible, past and present entwined. Why, therefore, in spite of these premises, the analogy still makes a sense? Here we will simply assume that either cultural evolution, of which material culture is part, and natural evolution are patterns of historical change: both are, as the ethimology of evolution suggests, forms of deployment whose order is open to systemic investigation. Comparing Darwinian principles, derived from either the classical theory or the Modern Synthesis, to principles of artificial evolution is not intended as a formal contribution to expected theories of technological change. What is demanded, at the most, is whether it is possible to obtain better (or improved) common understanding, in order to identify those general patterns that may be at the base of all systems that evolve historically. It is more a search for the regularities that govern the laws of change (not depending on the nature of the considered system). There is no similarity, therefore, to be theorised between living organisms and artefacts, between natural and artificial systems, between men and machines. Rather, it is matter of assuming that at the base of structurally similar systems that proceed by different self-evident rules, there may be general principles. In the light of the contemporary advancements of epistemological studies on the general nature of change in biological and cultural systems, it is plausible to assume that a unity of thinking may be found not in wrong applications of these evident rules (such as natural selection) to singular context (such as technological change), but rather in the search for more general rules of structure and change. Genealogies of artefacts Biology - like natural sciences in general - offers an uncommonly rich apparatus as a source for analogies to be applied to the domains of the artificial. The due premise rests on the choice of that part of theory proving to be effectively useful as a model. Once such an element is detected, the procedure implies a series of successive phases: the selection of the natural system to be investigated, the supposed coherence with its artificial analogue, the process of abstraction necessary to define the boundaries of the system to be investigated, the translation by which the representation of the model is produced. Businaro (1983, 464) argues that, when dealing with biological evolution, one may even refer to three points of view: (i) that of the palaeontologist, (ii) that of the biologist, (iii) that of the molecular biologist. The first aims at understanding the phyletic evolution of the biological world (Grassé 1973); the second deals with the evolution of single species through the study of populations (Dobzhanski 1970); the third investigates the basic principles of evolution at biochemistry level (Monod 1970). Also the evolution of the artificial may be approached from multiple perspectives. A hierarchy of perspectives may include at least: (i) the paleontological perspective on artefact evolution, (ii) the population perspective on families of products. The genealogical perspective is recurrent. It moves from pre-industrial times (Butler 1863) up to contemporary analysis (Deforge 1985, Simondon 1969, Campbell and Whelan 1985, Businaro 1982, 1983, Basalla 1991). According to this perspective the evolution of the artificial is mainly the evolution of artefacts (or objects, or products). As a unit of evolution, the artefact may represent the unit of analysis of genealogies, whose variations (or mutations) may trace the pathways of morphological and functional developments. The analogy based on the Darwinian model of evolution rests on the Darwinian principles of the struggle for existence, the survival of the fittest, the concept of variation. On the evolutionary model Simon (1969, 52) observes: “One way to create an artefact is to let it spring from the brain of a creator. Another is to let it evolve in response to some kind of selective force. The simplest scheme of evolution is one that depends on two processes; a generator and a test. The task of the generator is to produce variety, new forms that have not existed previously, whereas the task of the test is to cull out the newly generated forms so that only those that are well fitted to the environment will survive. In modern biological Darwinism genetic mutation is the generator, natural selection the test”. Considering the artefact as a unit of evolution, most contributions to technological Darwinism tend to converge in a vein describing the evolution of the products of human activity as a genealogical reconstruction of the artefacts offspring (Pitt-Rivers 1906; Blackwood 1970; Basalla 1988; Pantzar 1993; Steadman 1979). The sequence from simple to complex, from homogeneous to heterogeneous, represents the principles on which the scale of material progress is often based. Natural history plays a role as a source to derive methods or systems to be extended to artefacts classifications, so to obtain genera, species and varieties providing diachronic and synchronic descriptions4. The key concepts of Darwin's theory are often reduced to a paleontological vision of material culture. A concept of an orthogenesis of tools was introduced by Leroi-Gourhan (1964), admitting the hypothesis of the analogy with paleontological evolution as a technical general fact. The principle of variation has given raise to fruitful reflection on product variability. This resulted into interpretations for the notions of model and type, artificial genotype and phenotype5, inherited variations and environment-induced 4 A problem may be the missing links, that is the difficulty in establishing the adequate insertion of an object in a sequence, or the gaps of intermediate forms. 5 For Businaro (1982, 27), the genotype of a product could be the product specification and its technological regime. A specific design of a product could represent its phenotype and the product of a firm, a population. Ranges of products might be the equivalent of races or subspecies. modifications in artefacts, selective processes affecting artefact survival and adaptation (Businaro 1982, 1983; Campbell and Whelan 1985; Grassman 1985; Pantzar 1992). The progress of technological evolution proceeds by continuous improvements, the slow succession of sequences being invested by artificial selection allowing the evolution of the fittest, gradually modifying the survivors, discarding the less fit. Beyond its evocative effect, the evolution of artefacts may have rather limited extensions, resulting into a palaeontology or classification of artefacts. A positive functions has any way to be recognised to this approach: taxonomies and genealogies foster insight in the artefact status of existence: the object is not an inert entity any longer, but the living, active step of a sequence (a genealogy) that can be retroactively analysed, toward the ancestors and its genesis. A further re-evaluated comprehension of the object - now as product of the industrial culture - takes shape in the work by Yves Deforges (1985), approaching the evolutionary dimension as an essential tool for a reflection on industrial techniques. Beside the evocative dimension of the natural history of things, Deforge turns the evolutionary model into operative instruments: the notion of genetic offspring for industrial products, their laws of evolution, the systemic dimensions where systems of products co- evolve with the environment. Getting over the strictly metaphorical approach or the paleontological description, Deforge assumes the concept of evolution as a real, although rough, operative tool. Among the instruments proposed by Deforge, both the idea of genetic offspring and the formulation of evolutionary laws converge in elaborating the vision of industrial products diversification as a genetic continuum as well as a progressive adaptation to the context. This genealogical perspective is often centred on two levels of analysis: the phenotype and the genotype. In one case, morphological and technical variations affecting artefacts and products are explained in terms of survival of the fittest, progression from simple to more complex structures, increase (or decrease) of product variety, dominance or decline of morphological and functional solutions. In the latter, the reflection mainly invests the idea of type as artificial genotype that is the equivalent of the genetic heritage. Mechanisms of Lamarckian or Darwinian selection may be also proposed to interpret product proliferation or extinction, providing interpretations on product variety (Pantzar, 1992). It is however the hypothesis of the associated environment of a product that may open the innovative horizon of a systemic dimension. Here genealogies of artefacts can be analysed from multiple points of view: products as evolving within a system of production, machines and tools within a system of use, objects within a system of consumption. An evolutionary unit integrating the industrial object and its relation with the environment, i.e. the milieu associé,6 may be modelled. 6 Using Gilbert Simondon's words (1969, 57). Ecologies of products The population perspective may be outlined as the system perspective of competition and selection dynamics applied to technical systems at the large scale. The population (or ecological) perspective opens a systemic dimension7 that is absent in paleontological visions. With his theory of objects of sociological nature, Abraham Moles introduced the concept of demography of objects8 some decades ago. This demography of artificial products - with species and subspecies, rates of birth and ageing of products - leads to at least two kinds of considerations open to reflection: (i) an ecological perspective is outlined, with artificial species and their relationships (competition, predation and commensalism) as subject of study and a field of investigation; (ii) those populations enlighten an area of investigation which is absent in ecology: the continuous appearance of new artificial species9 (as compared to the relative fixity of living species in nature). The perspective opened by Moles is sided by the definition of technical species (Simondon 1969) formulated in the same years. The technical species defines distinctions between objects on the basis of their practical purpose. The technical object is interpreted in the dynamic dimension of its evolution as in a philogenetic line; it contains in itself structures and schemes that may determine its successive developments. Also Simondon - in his investigation of the evolutionary dynamics of technical “beings” - frequently uses notions as genesis, ontogenesis, philogenesis, morphogenesis, mutation, advocating a strict analogy between the rationales of living beings and the rationales of techniques (Maldonado 1998, 210). For Hottois (1984, 29) intuitive, self-evident common factors legitimate the analogy: (i) morphological continuity (that incorporates novelties and perpetuates old forms in nature; the evolution of species would correspond to the appearance of new artefacts in the artificial world); (ii) the progressive occupation of the ecological niches (on one side the survival of living species in the appropriate micro-habitat; on the other, technical species that may coexist only within infrastructures that assure its reproductive processes, conservation, and nourishment); (iii) a general principle of the struggle for survival (the fittest imposes itself in the biological as well as in the technologic world); (iv) the tendency to morphophilia (on one side the extraordinary exuberance of morphologies and interspecies variations, not strictly motivated by related 7 According to this approach, human populations and populations of artefacts coevolve through a selective use of technological systems to produce socio-cultural systems (Gallino 1987, 186). Here evolutionary units are technological systems, whose survival and reproduction may depend on the selection operated by other systems. 8 In the sense of the description of populations and their variations. 9 The definition of species still raises disputes among biologists. In case of sexually reproducing individuals, a species can be defined as a reproductively isolated group of populations. Others prefer to define species only as a taxonomic group, with individuals classified because of their similarities. In the case of man made objects, only the taxonomic definition provides a correspondence (Businaro 1982, 15). needs in term of function and adaptation; on the other, patterns of proliferation of products); (v) the abundance of variations, which do not always find an application (the unfavourable or recessive variations in nature; inventions and patents in technology); (vi) the nature of innovations as an integrative process (which as much in biology as in technology can reorganise everything that already exists); (vii) the sequence of stability and sudden discontinuities (mutation in nature, inventions in technology). On the premise of these intuitive aspects, it is further argued (Hottois 1984) that the transformation induced by a techno-evolution may acquire a mutational nature (that is a properly evolutionary) completely different from the implicit continuity of any historical transformation (1984, 132). The evolutionary perspective may support a category of discontinuity that is more radical than any historical hiatus. In this sense, technical progress may have never experienced the gap that the concept of mutation implies. The evolutionary perspective also drives to the vision of technical progress as a combining proliferation, where any invention is placed on a crossroad of multiple technical vectors, as an almost spontaneous self-growth (Ellul 1977, 229-248). About evolutionary units When referring to natural systems, main evolutionary units are: (i) the organism (basic unit of independent life that contributes to reproduction), (ii) the species (set of all organisms whose genotypes are so similar to allow interbreeding), (iii) the biological system (consisting of a set of interacting species). A long running-debate in evolutionary biology has led to the contemporary recognition that the most representative evolutionary unit may not be the individual organism - central in the classical Darwinian perspective - but the population (aggregation of members of a species) or the whole biological system, where either genotype and phenotype evolution can be observed. Also within the artificial systems a hierarchy of evolutionary units can be traced, including the single artefact (in the typological perspective), the product aggregates (in the population perspective), the artificial system as an ecosystem (the enlarged systemic perspective)10. Technology itself - as the set of a population of material and non-material systems and as a set of organs, and more analytically of traits, properties or characteristics, subject to continuous variations, which are accepted or transmitted in differential form by human populations (Gallino 1987, 181) has been placed in a neo-Darwinian perspective11. Gallino (1987) argues that each technological system and its successive replicas are gradually modified in 10 In economic studies (Saviotti and Metcalfe 1991) two main levels attracted theorists: that of the product and the one of the industrial system. Emphasis on the product as an evolutionary unit has been progressively substituted by a systemic approach that considers the industrial system as a whole. 11 The theoretic bases of the neo-Darwinian perspective lay on the synthesis of the progression and discontinuity of evolution. time, so that at a given moment a technological population will present a distribution of variants different from the preceding moments: which is evolution (in Darwinian terms), or micro-evolution, as the Modern Synthesis defines it. But, there is also the possibility that structural new systems may appear as the equivalent of the leaps defined as macro-evolution (i.e. system changes that do not derive from micro-evolution). This could explain the generation of technological systems that can substitute former ones, while co-existing with them. Beyond the heuristic sense of the metaphoric procedure, wider perspectives are now opened towards co-evolutionary visions where biology, technology, social and cultural processes works as links of a general evolution. Human organisms, technological systems and socio-cultural systems interact in a coevolutionary circuit, where human populations influence the idoneity of technologic systems and, through these, they affect biological and sociocultural evolution. As Gallino observes (1987, 186), organisms of the first order (human beings) selectively use organisms of the second order (technological systems) to reproduce themselves and to reproduce organisms of the third order (socio-cultural systems); human beings accelerate the evolution of technological systems and their dependence on these, with longterm effects on the probability of collective survival. This circuit has not yet been the product of an intentional design. Through their technological choices, social actors join in determining the future of their species. The technological populations that will descend from the contemporary ones will be the result of these choices, carried out in a relationship between technology and society, which goes through states of the process of co-evolution between biology and culture12. Adaptation as a dynamic process The developments of the notion of adaptation (Lewontin 1977) may provide further useful insights for possible interpretations of the evolutionary dynamics of man made systems and the related design strategies. Richard Lewontin (1977, 198) observes that adaptation is a concept related not only to life evolution but to culture in general, where it appears as functionalism: it's a concept stating that there are “problems” that living organisms or societies have to solve: present forms of life on earth or present social organisations are solutions to those problems. The description of adaptation in terms of "solutions" to "problems” implies that a problem comes first, and then organisms adapt to that condition with a dynamic process: this process is called "adaptation" and the result is "being adapted" (Lewontin, 1977, 199). The fundamental question raised about this traditional vision of biological adaptation concerns the pre-existence of problems. The admission - as 12 In their analysis of technological change as guided by a principle of survival of the fittest, Campbell and Whelan (1985, 284) propose that “just as genes are the units of biological evolution, and memes those of cultural evolution, venes are the units of technological selection”. indicated by classical evolutionary theories - that organisms adapt to the environment implies that ecological niches exist apart from organisms. But this is in contradiction with the definition of the ecological niche, which is made up of the multidimensional relations of an organism with the surrounding environment (Lewontin 1977, 200). To avoid this contradiction it has to be assumed that organisms themselves define the niche: but in this case all species should be already adapted and they needn't be adapted any more. So how could a species be adapted and in adaptation at the same time? (Lewontin 1977, 201). In biology the paradox has been solved with the admission that the environment is in constant decay and that its organisms are forced to evolve to maintain their condition of adaptation. It is the so-called Red Queen model (from the character by Lewis Carroll), theorised by Leight van Valen. This theory assumes that the environment is unceasingly decaying and that selection operates so that the organisms' adaptation is maintained, not improved (Lewontin 1987, 37). Evolutionary adaptation is an infinitesimal process: organisms are unceasingly adapting, following the conditions of an environment that is constantly changing (Lewontin 1977, 201). Assuming the notion of adaptation as a dynamic process of constant adjustment of organisms to their environment suggests coherent visions of the relation between organisms and their environments. In the classical context of the survival of the fittest the environment stands as a resource and an obstacle; furthermore, while the organism is active the environment is passive and static. Orthodox approaches focusing on organisms and considering the environment as an auxiliary category are overcome by new perspectives (Lewontin and Levins 1978, 1041-1045) where organisms and their environment can not be isolated: the environment is the product of the organism activity. Specific observations related to this statement at least imply that: 1. organisms select their environments, positively reacting to favourable signals; 2. organisms modify their environments by consuming resources, disposing wastes deriving from their activity, building habitats; 3. organisms define their environments; 4. environmental factors interfere with the physical structure of organisms; 5. organisms react to environmental changes; 6. each part of an organism acts as environment for other parts: in this sense evolution can be considered as the reciprocal adaptation of the different parts of an organism. A considerable part of modern evolutionary biology thus assumes that the evolution of living beings is an active agent of transformation of the environment, which in turn influences organisms (Lewontin 1977, 201). The environment cannot be considered an independent process any longer, as there is no organism without its environment nor environment without its organisms (Lewontin 1983, 91). Should the above statements turn into analogies to be extended to artificial systems, we could assume that: 1. artefacts, products, technical systems select their environments, positively reacting to favourable conditions; 2. artefacts, products, technical systems modify their environments by consuming resources, disposing wastes, building artificial habitats; 3. artefacts, products, technical systems define their environments; 4. artefacts, products, technical systems react to environmental changes; 5. artefacts, products, systems are integrated in their environment, so that no components of a man made system can be isolated from its environment; 6. a dynamic process may take place, where each evolutionary unit of artificial systems (artefacts, families of products, product populations) is in evolution in relation to the others; 7. man made systems and the natural environment are related to such an extent that effects on the latter depend on the first one and viceversa. Extreme environmental changes There are limits to the constant process of co-adaptation between man-made systems and their environment. As we know from evolution sudden environmental change of large entity may allow neither chance nor time to systems to adapt to new conditions. At the micro-scale of industrial products this may occur whenever a specific need ceases, causing the extinction of products related to that need. At the macroscale of the industrial systems, the hypothesis that a technological system and its environment constitute an integrated unit goes with the possibility (Luhman 1986) that a man made system may affects its environment on such a large extent, that it can not exist in that environment any longer: a process defined by biology as the excessive exploitation of an ecological niche. That is to say: a process of adaptation - either for natural ecosystems and artificial systems - is not always beneficial. As Gregory Bateson (1979) remarked, the cases of adaptation making nature appear so intelligent and witty can be the first steps to pathology and excessive specialisation. Among the adaptations that are ruinous in the long term there is the case of the species so well adapted to its niche to destroy it: such a dynamics can be applied to artificial systems, mainly in terms of those technological alternatives that although positive in the short term turn to be negative at length. Adaptive changes may be positive at the beginning, but they can exhaust any system flexibility in the long term. No cultural barriers exist to avoid the influence of rapid environmental changes causing adaptive changes in man made systems (Degli Espinosa 1990, 194): whereas biological systems are protected by the so called Weissmann barrier from too fast environmental influences (the barrier avoiding the Lamarckian transmission of acquired changes), in social, technical and cultural systems no barriers of any kind prevent from influences deriving from environmental changes. Conclusion: towards innovative interactions Could it be useful to start drawing maps of the elementary interactions among the components and structural parts of man made systems as ecosystems? If we look again at natural systems we learn that all the different interactions between pairs of species can be essentially classified into: a. competition (a species having an inhibiting effect on the other); b. commensalism (each species having an accelerating effect on the growth of the other); c. predation (the predator having an inhibiting effect on the prey and the prey having an accelerating effect on the predator). Competition is virtually the only category of interaction to be studied beyond the disciplinary borders of biology13. Comparative economic studies on competition, selection, or commensalism in industrial system are traditionally embedded in the concrete reality of market laws and factors. An evolutionary system perspective might go beyond the aseptic analysis of economics to demonstrate that artefacts and systems interactions may get over market factors, by taking place within a more complex environment that is not made up only of market elements nor it is made up of a priori conditions. Going back to the ecological niche model, a man-made evolutionary unit could be essentially described as the complex including: (i) the physical conditions within which populations and system of artefacts evolve (including natural constraints and resources limits); (ii) the framework of relations set up by the artificial system components (relations between technical species and populations of products, and between species and population and their niches); (iii) the effects that technical species and artefacts population produce on their niches. This comprehensive environment stands as a flexible evolutionary unit, where man made systems and products can not be isolated from their context, each of them being at the same time subject and object of the other's evolution, according to a constant, reciprocal process of successful or failing adaptation. New interactions are open for investigation from the design angle: from symbiosis between families of products to commensalism for product populations. Would the idea of a symbiotic design for products be feasible? Are designers aware of the commensalism properties that could affect – positively or negatively - product strategies for the future? Would designers be attracted by future visions where no product or system design can be isolated from the texture of its environmental interactions? References Basalla, G., 1991. The Evolution of Technology. Cambridge: Cambridge University Press. Bateson, G., 1979. Mind and nature. A Necessary Unity. 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Academic experience includes appointments as Professor at Politecnico di Milano since 1996 for the Degree course in Industrial design; tutor and research supervisor within the Department of Industrial Design of Politecnico di Milano; post-doctoral research fellow; co-ordinator for research projects funded by the European Commission; scientific co-ordinator and chair of the organising committee for the Design plus Research conference held in 2000 at Politecnico di Milano. Principal areas of research interest are: theory of design, the design of research into design, doctoral education in design, research methodology. Contact Prof. Silvia Pizzocaro Politecnico di Milano Facoltà di Design, Dipartimento di Industrial design via Durando 38/a, 20158 Milano, Italia phone: 39 02 2399.5984 e-mail: [email protected]