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FROM CONTROVERSIES TO CONFLICTS BETWEEN WORLDS. THE TRIALS OF SOCRATES AND GALILEO AS EXAMPLES1 Oscar Nudler 1. Worlds and sub-worlds: a complex structure In a series of papers2 on scientific and philosophical controversies, I introduced the concept of controversy space. My main reason for doing that was heuristic. The fact that controversies are not, to put it metaphorically, isolated stars but relate to each other forming constellations turned in my view necessary to put the research focus not on single controversies but on controversy spaces. With the help of a model of the structure and evolution of controversy spaces, I then showed how the history of a number of cases in diverse scientific and philosophical fields can be reconstructed following a common heuristic pattern3. Now my purpose is to take a step further and explore the relation of controversy spaces with their social and cultural contexts. Social life entails the participation of individuals in a wide diversity of worlds: their own subjective world, the world of their family, their neighbourhood, their profession, their social class, their religious 1 Included in A. Jiménez Perona (ed.), Normativity and Praxis, Mimesis International, MIM Edizioni, 2015. Oscar Nudler, “Is There Progress in Philosophy?A Russellian View”, Principia. An International 2 Journal of Epistemology, vol. 5, n. 1-2, pp.253-281 (2001) Oscar Nudler, “Hacia un modelo de cambio conceptual: espacios controversiales y refocalización” Revista de Filosofía,Universidad Complutense de Madrid, Vol. 29, 2 (2004) Oscar Nudler “Controversy Spaces: The Dialectical Nature of Change in the Sciences and 3 Philosophy” in O. Nudler, ed. Controversy Spaces. A Model of Philosophical and Scientific Change (Amsterdam-Philadelphia: John Benjamins, 2011) group, and so on until reaching their “historic world”, the world encompassing all the others. So, between the subjective or personal world and the historic world there is a plurality of intermediate worlds, or sub-worlds4. But what shall we understand by “world”? This term will be used here not to refer to an objective entity, independent of any subject. Quite the opposite, the term will in this context refer to the world of a given subject, either individual or collective. But nor does the term refer either to an entity invented by the subject, as in the case of the worlds of fiction. It is part of the process of constitution of the subject to internalise the distinction between a “real” world and fictional, dreamlike and other kinds of non-real worlds. A world provides the individual with the conditions of intelligibility of what occurs, including what occurs to her. These conditions –as has been emphasized by twenty century philosophers as diverse in other aspects as Heidegger, Dewey, and Wittgenstein– constitutes a prereflective background that the subject progressively internalises, not through thinking, but through action5. In other words, the subject is not primarily a thinker or a “spectator”, as John Dewey claimed on criticizing what he called the spectator theory of knowledge. Instead of regarding the scene from the outside, the subject is an actor set in it from the very beginning. Of course, she has not been previously asked Karl Popper, in his well-known three worlds theory uses the term “world” to refer to each one 4 of the three areas into which he divides reality: the physical world or the world of physical objects (world I), the world of mental states or processes (world II), and the world of “the products of human mind” (world III) When he intends to refer to the three worlds as a whole, he uses the term “universe”. As may be seen, I do not follow Popper in his use of the term. Karl Popper, Objective Knowledge: An Evolutionary Approach (New York: Clarendon Press, 1972) 5 Ludwig Wittgenstein, On Certainty, ed. by G. E. Anscombe and G. H. von Wright (London: Harper, 1969, p. 110) whether she agrees to play the role or not, she is just playing it. But this does not imply, as Nikolas Kompridis6 asserts, that she is necessarily a prisoner of a situation that she did not choose. In certain conditions and within certain limits, and thanks to a reflective work directed not at things, but at the way of constructing things, she can gain an awareness –albeit partial– of the pre-reflective background upon which she operates in the world and acquire the capacity of decentering it. The subject ceases in such case to be a passive follower of rules to become an agent. Kompridis has dubbed this upgraded awareness “second-order disclosure”, thereby distinguishing it from the pre-reflective process of constitution of the subject and her world (“first-order disclosure”). Let us distinguish between conflicts in which the parties share the same world –intra-world conflicts- and conflicts in which they don`t –interworld conflicts-. These two opposite types of conflicts are pure or ideal in Weber´s sense, that is to say, if we draw an imaginary line uniting the two extremes, real conflicts will locate on some point of such line but never on any of the extremes. In other words, real conflicts are not of a pure intra-world or a pure inter-world nature. However, their distance from the extreme points may tell us a lot about their nature. So, there are conflicts in which the difference between the worlds of the parties is so minimal that in practice they may be considered as pure intra-world conflicts. On the other hand, there are conflicts in which world differences between the parties are so great that they naturally are seen as pure inter-worlds conflicts. I divide further this latter type of conflicts into two kinds: those in which world differences do not preclude the possibility of understanding of the other party´s world and those in which they do. If this second alternative is the case, 6 Nicholas Kompridis, Critique and Disclosure: Critical Theorybetween Past and Future (Cambridge, MA and London: MIT Press, 2006) we will say that the worlds in which the conflicting parties live in are mutually incommensurable. To illustrate the former type of conflicts we will turn, as an historical example, to the trial of Galileo and, in order to illustrate the latter, we will focus on the trial of Socrates. The reason for selecting these examples7 is that they reveal on a micro scale the nature of different types of inter-world, macro conflicts. From a practical perspective, I am persuaded that taking into account inter-world differences may be crucial to facilitate conflict resolution or transformation8. Unfortunately, more often than not workers in the field ignore world differences and, as a consequence, follow the same methodology in cases in which they are relevant and in which they aren´t. No wonder that the price they pay in cases of the first kind is sheer failure. The point is that in those conflicts in which world differences prevent the parties of getting an understanding of the other party´s stance, a preliminary task of common ground building is required. Only in case this usually difficult phase ends successfully, we will say that a “primitive” form of conflict has been transformed into a more sophisticated, dialogical one, i.e., into a controversy. In other words, for a conflict to be considered a controversy it is necessary that, together with the disagreement between the parties around which the controversy revolves, there is an agreement –often implicit– on a certain set of presuppositions9. To 7 The term “example” as applied to an event is used here to imply that such an event has universal significance without losing its irreducible uniqueness. For an illuminating treatment of exemplarity see the text of Alessandro Ferrara, The Force of the Example: Explorations in the Paradigm of Judgment (New York: Columbia University Press, 1986). Oscar Nudler, “On Conflicts and Metaphors: Towards an Extended Rationality” in Conflict: 8 Human Needs Theory, ed. by J. Burton, ed. (New York: St. Martin’s, 1990) Oscar Nudler “Controversy Spaces: The Dialectical Nature of Change in the Sciences and 9 Philosophy” in O. Nudler, ed., Controversy Spaces. A Model of Philosophical and Scientific Change (Amsterdam-Philadelphia: John Benjamins, 2011) put it shortly, disagreement requires agreement. For instance, two scientists may disagree on which law helps explain a given natural fact, and at the same time agree on the lawfulness of nature. In addition to ontological or metaphysical presuppositions such as the just mentioned one, controversies also presuppose shared assumptions of an ethical or aesthetic nature. Besides, on top of these substantive assumptions, there must also be shared procedural ones such as, for instance, on what is acceptable as evidence, on what would imply that the controversy has reached an end, and so on. 2. Crisis of worlds and crisis of meaning Worlds have a structure in which we may distinguish, following Habermas10, three interrelated dimensions: society, culture and personality or subjectivity. By society we mean the network of intersubjective relationships patterned according to a common set of rules. Culture, in turn, stands here for the shared meanings that subjects attach to social rules, the behaviour following them, and the products of such behaviour. Finally, subjectivity refers to the psychological ways in which subjects experience and react to their social and cultural context. Subjects attribute meaning to actions and events on the basis of common cultural meanings and shared social rules. This process of meaning attribution usually works in an unconscious, automatic manner. Only when what actually happens fails to meet the subject`s expectations, the process of meaning attribution becomes conscious. In such cases the subject normally tries to fill in the gap in her horizon of expectations by searching for additional information. A world in which those gaps can always, or most of the times, be closed up without altering the shared horizon of expectations, or altering it just 10 Jürgen Habermas, Theory of Communicative Action (Boston: Beacon Press, 1984) to a minimal, superficial extent, is a world which is stable or in equilibrium. On the contrary, a world in which meaning gaps, instead of being closed not only remain but also proliferate, is a world in crisis, a world approaching the point of disequilibrium or disintegration. Now, when I speak of failure in attributing meaning to actions and events, I am not necessarily referring to their meaning in terms of their immediate context. The actions performed by an individual, if taken in isolation, can make perfect sense to her and to other participants in the action setting. However, if larger segments of an individual`s actions are taken into account, and especially if her entire life is pondered, then the answer to the question about their meaning may be rather different. A paradoxical contrast between the meaning of limited chunks of action and the meaning of the totality of them would thus be the result of confronting two perspectives, an atomistic and a holistic one. According to nihilism -a philosophical view advocated not only by philosophers but also by poets and artists- such contrast should not be at all surprising since human life is meaningless. There is perhaps no more concise and at the same time precise expression of nihilism than the statement that Shakespeare puts in the mouth of his character Macbeth: “Life is a tale told by an idiot full of sound and fury, signifying nothing”. Without entering into the philosophical debate around nihilism, let us only note that nihilism is a view that becomes more appealing in times of crisis. At the individual level, the preceding example provides a good illustration of the association between nihilism and personal crisis: Macbeth expresses a nihilist view of life only after the death of his wife, who goaded him into committing regicide, and the concrete, ominous prospect of being defeated by his enemies. At the social level, a clear example of the same association is provided by Hugh Trevor- Roper`s description of the seventeenth century “general crisis” in Europe: Ever since 1618 at least there had been talk of the dissolution of society, or of the world; and the undefined sense of gloom of which we are constantly aware in those years was justified sometimes by new interpretations of Scripture, sometimes by new phenomena in the skies. With the discovery of new stars, and particularly with the new comet of 1618, science seemed to support the prophets of disaster11. Trevor-Roper correlates such widespread “sense of gloom” with a series of highly disruptive events, particularly long, destructive wars (the Thirty Years War, the Civil War in England, and many others). Although these wars did not cause the crisis, they had the effect of deepening it. According to Trevor-Roper, the crisis was already under way before the wars and was caused by a weak or too rigid social structure: A firm, elastic, working structure—like that of England in the nineteenth century—is proof against revolution however epidemic abroad. On the other hand a weak or over-rigid social structure, though it may last long in isolation, will collapse quickly if infected. The universality of revolution in the seventeenth century suggests that the European monarchies, which had been strong enough to absorb so many strains in the previous century, had by now developed serious structural weaknesses: weaknesses which the renewal of general war did not cause, but merely exposed and accentuated12. 11 Hugh Trevor-Roper, The crisis of the seventeenth century.Religion, the Reformation & social change, (London: Liberty Fund, 1967), p. 44. 12 Ibid. p. 43. Trevor-Roper concludes that the decisive feature of the seventeenth century crisis was the divorce between civil society and the State. I should add that such divorce seems to characterize not only that particular crisis but all historical crises of worlds as well. 3. Clashes between old and new worlds: the trial of Galileo. History teaches that all worlds end up disintegrating. Some of them, particularly the ancient hydraulic civilizations of Egypt or China, seemed over millennia to be eternal but even they finally disappeared. Historic worlds can find themselves in different phases of their life cycles: constitution, expansion, decadence, crisis, and disintegration. A world does not necessarily go through all of these phases, with the exception of the first and the last. Let us focus on the crisis phase. As suggested above, as a historic world crisis evolves, it may move closer and closer to the point of disequilibrium or catastrophe, in René Thom`s meaning of the term13. Or, alternatively, the structure of the world may resist and reabsorb the tensions provoked by its crisis. Well-known twenty century cases of collapse of historic worlds are the disintegration of the Soviet Union and, some decades earlier, the vanishing in the air, so to speak, of the AustroHungarian Empire. The most frequent historical case, however, is the gradual disintegration of an old world and its replacement by a new one. Even when the new world has been fully deployed, remains of the old world do not necessarily disappear. In some cases they may retain a substantial dose of power, as the case of the Roman Catholic Church and its essentially pre-modern structure shows. 13 René Thom, 1976 distinguished between a “catastrophe”, an event that destroys the structure of an entity, and a “crisis”, a process that alters its functioning but does not necessarily destroys it. A characteristic sign of the crisis of a world is an increased intolerance towards diversity. Defenders of beliefs and behaviours that deviate from established rules and values who were before the crisis tolerated, though always within certain limits, become the target of persecution. The power elite, who felt secure in the pre-crisis time, is now on the defensive. It sets out to find –orto invent– scapegoats, i.e., individuals or groups “guilty” of trying to subvert the established order. This is precisely what happened to Galileo during the world crisis of the seventeenth century. Let us take a closer look at this case which, as anticipated, I have selected as an example of conflicts between worlds which are not mutually incommensurable. There are several alternative interpretations of the true reason why Galileo was tried and condemned. The most obvious is his campaign in favour of Copernican heliocentrism and against Aristotelian geocentrism. However, as Cardinal Inquisitor Bellarmine made clear in a letter to father Foscarini, author of a Copernican booklet, the Catholic Church was not opposed to using the Copernican theory as a tool for “saving appearances”, that is to say, for calculating and predicting the trajectories of celestial bodies on the basis of astronomical observation data. What the Church rejected was the belief that Copernican theory represents the real movement of those bodies. Thus, for Pierre Duhem and other Catholic scholars, the conflict between Galileo and the Church was of an epistemological nature, namely, a conflict between Galilean realism and Bellarmine’s instrumentalism. But this epistemological reading of the conflict has been played down by a doctrinal interpretation that claims that the main problem stem from the clash between Galileo´s mechanical view of nature and the teleological Aristotelian official view. In my view, none of the available interpretations of the Galileo trial, in spite of the fact that many of them are partially true, provides, if taken in isolation, a truly satisfactory account of the case. Perhaps a combination between the clash of views of nature interpretation and the political one may do better. However, a deeper understanding of the Galileo affair should take into account the nature of the struggle between worlds going on in the background. It was a struggle between a still dominant world represented by the Catholic Church and the emerging modern world represented by Galileo and his disciples and followers. However, though Galileo challenged the established view of nature, he did not challenge the old world and its power structure in other areas, particularly in the area of religion and morality. He fully accepted –as a good Christian he was– the Church’s authority on these matters. He differed in this respect from another famous Copernican, Giordano Bruno. Their difference explains the different fates of both men, one burnt at the stake and the other held under supervised house arrest for the rest of his life. To conclude this section, the conflict between Galileo and the Catholic Church was a conflict between two worlds that clashed in certain areas but not in others. Hence the two worlds were not incommensurable in any of the usual meanings of the term. In particular the Jesuits, who were the intellectual and ideological vanguard of the Counterreformation, included among their ranks mathematicians and astronomers as competent as Clavius who were perfectly familiar with Copernican theory and its mathematical apparatus and, as was rumoured, secretly supported it. However, members of this order, among them Father Scheiner, the founder of heliophysics, contributed decisively to bringing Galileo to trial. On the other hand, the pope Urban VIII, who as Cardinal Barberini wrote in 1620 a poem expressing his great admiration for the author of the Starry Messenger, a report of Galileo´s observations of the heavens through the telescope, became in 1633 his inflexible persecutor. The trial of Galileo might be represented as a drama with two characters on the stage defending conflicting worlds, one old and still hegemonic and the other young and defiant. The emerging, new world is not always as visible as it was in the Galileo´s case. Sometimes it is mostly invisible, though it is growing deep down, in the underground of the old world. Even great thinkers may fail to sense its hidden presence. For example, Plato and Aristotle, writing at a time when the end of the polis as the locus of politics was underway, still took for granted that it would continue to be the basic political unit. In many cases poets and artists, instead of philosophers or scientists, develop an awareness of the subterranean current that, when emerging, will constitute a new world. For instance, Charles Baudelaire anticipated in The Flowers of Evil the fragmentation between the spheres of value described by Max Weber several decades later as a result of capitalist modernization. Another well-known example of such an anticipatory vision is Franz Kafka who anticipated the world of twenty century nazi totalitarianism. 4. Conflicts between incommensurable worlds. The trial of Socrates. Let us turn now to the trial of Socrates, our second historic example. As mentioned, it illustrates our second type of conflicts, namely, conflicts between incommensurable worlds. But before addressing this example, I should briefly refer to the notion of incommensurability. Thomas Kuhn, in the first version of his thesis on the incommensurability between paradigms, claimed that after the substitution of an old paradigm by a new one scientists work in a “different world”14. This concept of incommensurability between theories is a metaphorical extension of the mathematical notion of absence of a common measure between magnitudes. The lack of a common measure is understood in the case of incommensurable 14 Thomas Kuhn, The Structure of Scientific Revolutions (Chicago: University of Chicago Press 1962) theories as the lack of a third, neutral language, to which both theories may be translated15. Although without using this term, somehow such view was anticipated by Hegel in his discussion of the trial of Socrates. A question that remains open after 2,500 years of the trial is which was the real accusation against Socrates. According to his accusers, he committed an essentially religious crime, namely: not believing in the gods in whom the city believes, introducing new divinities and corrupting the youth. Socrates himself, in his defence speech as has been rendered by Plato in his Apology of Socrates, claimed that an even more serious religious accusation –the accusation of atheism, i.e., of not believing in the existence of gods at all- has been spread by his enemies among the Athenians for so many years that it was very difficult for him to convince the members of the jury of his innocence in the short time available. However, according to an alternative, widely held interpretation, the real accusation was not religious but political. Those who defend this interpretation invoke Socrates’close ties with conspicuous enemies of democracy such as Critias and Alcibiades. Likewise, Socrates refusal to participate in the political institutions of the city, particularly the Assembly, was considered a serious violation of the main civic duty of any Athenian citizen. But, if this was the accusation, why didn’t his accusers make it explicit? The answer given by those who defend the political interpretation is that the amnesty against political crimes that the Assembly had sanctioned some time earlier prevented them from using such evidence. Consequently, the accusers used the religious charge as a smokescreen to bring Socrates to trial. These and other interpretations that have been offered have in common, despite differing on their answers to the question of why Socrates was tried, the assumption that Socrates and the people of 15 As is well known, Kuhn limited afterwards the scope of the concept of incommensurability to the linguistic level. Accordingly, he did no longer speak of different worlds in relation to it. Athens represented by the jury shared the same world. The conflict, whether religious or political or, as has plausibly been claimed, both religious and political –did not imply that Socrates did not belong to the same world as his accusers. But, as suggested above, Hegel challenged this assumption. In his view, Socrates’ trial was a tragic collision between two opposing forms of consciousness and two forms of law. One –that of the people of Athens– was an objective law, external to the individual, whereas the other –Socrates' law–was a new law founded on the interiority of the subject, a subject who submits her life to permanent cross-examination. In the words of Hegel: Two opposed rights come into collision, and the one destroys the other. Thus both suffer loss and yet both are mutually justified; it is not as though the one alone were right and the other wrong. The one power is the divine right, the natural morality whose laws are identical with the will which dwells therein as in its own essence, freely and nobly; we may call it abstractly objective freedom. The other principle, on the contrary, is the right, as really divine, of consciousness or of subjective freedom; this is the fruit of the tree of the knowledge of good and evil, i.e. of self-creative reason; and it is the universal principle of Philosophy for all successive times. It is these two principles which we see coming into opposition in the life and the philosophy of Socrates16. Thus, according to Hegel Socrates died as a result of a tragic clash between incommensurable worlds. Was then Socrates a tragic hero, whose fate had been determined from the outset? Or was he the 16 George Wilhelm Friedrich Hegel, Lectures on the Philosophy of WorldHistory, 1821-1831 (Cambridge: Cambridge University Press, 1975, p. 29). victim of a series of circumstances that could have had a different outcome? Students of the trial are sharply divided in this regard. Most of them favour the latter reading, i.e., that a contingent set of events led to Socrates condemnation. It is on the basis of this shared presupposition that they disagree on the main cause of the jury decision against Socrates: religious, political, both political and religious, a supposed self-defeating defence of his case made by Socrates, and so on. However, other interpreters, from Hegel onwards, think as just mentioned that far beyond these causes there was something deeper playing a decisive role. For instance, the Plato scholar Terence Irwin claims that it was “easy” for his accusers to believe that Socrates was something he was not since they failed to recognise that he was “something new, a moral philosopher” 17.In order to be able to accuse him he was put in a place – natural philosopher and Sophist- that did not correspond to him. That is to say, Irwin implies that the accusers and Socrates were separated by an incommensurability breach. As anticipated, I side with this interpretation. A clear manifestation of this incommensurability breach is Socrates´strangeness or atopia, so vividly described in the Socratic dialogues written by Plato. See, for example, what Phaedrus said to Socrates in the following passage: You are an amazing and most remarkable person. For you really do seem exactly like a stranger who is being guided about, and not like a native. [But] you don't go away from the city out over the border, and it seems to me you don't go outside the walls at all (Phaedrus, 230c-d). . 17 Terence Irwin, Classical Thought (New York: Oxford University Press, 1975, p. 84) In short, Socrates doesn´t seem to be an Athenian and doesn`t seem to be a stranger either. He was átopos. 5. Concluding remarks Socrates trial illustrates, according to the preceding interpretation, the conflicts that involve worlds that are mutually incommensurable. But an important qualification should be added: the worlds of Socrates and the Athenian citizens were only locally, not globally incommensurable worlds. The fact is that Socrates and the people of Athens, along with the breach that divided them, shared a considerable number of beliefs, including the crucial belief in the existence of gods. In contrast, the trial of Galileo does not imply any form of incommensurability. It is true that Galileo and his adversaries had strongly opposed views of nature and the epistemic authority –scientific or theological- who is entitled to legitimize the knowledge of it. But even so, there was no communication or understanding gap between them. Now, as these historic examples show, conflicts between worlds –whether incommensurable or not– are certainly not new. However, in our present historical juncture, the nature of these conflicts has changed to a considerable extent. I shall close this essay with a brief outline of my view in this regard. A novelty in connection to inter-worlds conflicts is that they have become far more complex. The reason is that the ongoing process of globalization is having a double, contradictory impact. Together with its traditional centrifugal effect, i. e., the increasing cultural homogenization of the world associated to the expansion and hegemony of the West, there is a more recent centripetal effect, represented by the massive movement of migrants from other regions and cultures to the centre, with the result of a growing heterogeneity of the societies in which they settle in. As a consequence, it is no longer necessary for citizens of the so called First World to travel to distant places in order to find utterly different worlds. They can find them around the corner, in their own neighbourhood. So, conflicts between worlds, including conflicts between incommensurable worlds, which some decades ago mainly involved people living in separate territories, also involve today parties living in the same place. And since the two kinds of inter-world conflicts are, in turn, interconnected, the complexity of the conflicts between worlds we are witnessing today has grown accordingly18. If we add to this complexity the fact that the world is in a state of deep crisis promoting the concentration of power in the hands of a small, powerful elite, the prospect is certainly gloomy. However, the growing of emerging forms of awareness and action is at the same time fostering the hope in the upcoming of a new, more humane world. Bibliography Ferrara, Alessandro,The Force of the Example: Explorations in the Paradigm of Judgment(New York: Columbia University Press, 2008) Habermas,Jürgen,Theory of Communicative Action(Boston: Beacon Press, 1984) Hegel, George Wilhelm Friedrich,Lectures on the Philosophy of WorldHistory,1821- 1831 (Cambridge: Cambridge University Press, 1975) 18 An additional problem is that the theories at our disposal to account for this complexity were designed for societies that were much more homogeneous than ours. I briefly deal with this problem in the case of political theory(Nudler, 2012) Irwin, Terence,Classical Thought (New York: Oxford University Press, 1975) Kompridis, Nicholas, Critique and Disclosure: Critical Theory between Past and Future (Cambridge, MAandLondon: MITPress, 2006) Kuhn, Thomas,The University of Chicago Structure of Scientific Revolutions(Chicago: Press 1962) Nudler, Oscar, “On Conflicts and Metaphors: Towards an Extended Rationality” in Conflict: HumanNeeds Theory, ed. by J. Burton, ed.(New York: St. Martin’s, 1990) Nudler, Oscar,“Is There Progress in Philosophy? On the Nature of Philosophical Controversies”, Principia, vol. 5, n. 1-2, pp. 253- 281(2001) Nudler, Oscar, “Hacia un modelo de cambio conceptual: espacios controversiales y refocalización”, Revistade Universidad Complutense de Madrid, Vol. Filosofía, 29, 2 (2004) Nudler, Oscar, “Controversy Spaces: The Dialectical Nature of Change in the Sciences and Philosophy”, Spaces. A Model of Philosophical and in O. Nudler, ed.Controversy Scientific Change(Amsterdam-Philadelphia: John Benjamins, 2011) Nudler, Oscar,“Modern Political Ontology: Evolution and Revolution" inGuillermo Hurtado and Oscar Nudler eds. The Furnitureof the World. Essays in Ontology and Metaphysics, (Amsterdam – New York: Radopi Philosophical Studies, 2012) Popper, Karl, “Three Worlds” Tanner lecture delivered at the University of Michigan, Objective Knowledge, 12 (New York: Clarendon Press, 1972) Thom, Renée, “Crise et Catastrophe”, La notion de crise,Communications, Revue, 25 (París: Editions du Seuil, 1976) Trevor-Roper, Hugh,The crisis of the seventeenth century.Religion, the Reformation & social change, (London: Liberty Fund, 1967) Wittgenstein, Ludwig, OnCertainty, ed. by G. E. Anscombe and G. H. von Wright (London: Harper, 1969)