Diego Garcia Rincon

This dissertation challenges the still widespread view, first expressed by Aristotle (Metaph. A 987a32 ff.), that Plato regarded the perceptible world of nature as unknowable because of its constant change. I approach this issue through its linguistic implications, arguing that Plato distinguishes between two kinds of flux: radical flux (RF), which renders meaningful language impossible, and moderate flux (MF), which remains compatible with it. RF posits that everything is always changing in all respects, thereby undermining the conditions for reference and truth. MF, by contrast, allows that perceptible things are always changing in some respects while retaining the stability required to be objects of truth-evaluable language. I argue that Plato critiques RF and attributes only MF to the perceptible cosmos. To explain how the cosmos exhibits MF rather than RF, he introduces unchanging metaphysical principles that secure its partial stability and intelligibility. On this basis, I demonstrate that Plato’s natural philosophy enables meaningful discourse about the perceptible cosmos, suggesting that cosmology constitutes a limited yet genuine form of knowledge, despite the world’s continuous flux. The dissertation develops this argument in two parts: Chapter 1 and Chapters 2–4. Chapter 1 analyzes Plato’s critique of RF in the Theaetetus (182c–183b), where he argues that if everything is always changing in all respects, reality becomes metaphysically indeterminate. Since determinacy is a necessary condition for reference and predication, RF renders language impossible. This critique motivates the need for a moderate account of change that preserves sufficient stability to secure linguistic reference and epistemic access to the perceptible cosmos. Chapters 2 through 4 turn to the Timaeus and reconstruct Plato’s positive account of MF. While MF avoids the collapse of language, it still raises a residual challenge: how can language and intelligibility remain possible in a perceptible world that is, in some respects, always changing? To meet this challenge, Plato introduces three metaphysical principles—the Receptacle, the Forms, and Intelligent Productive Causes—that jointly stabilize the perceptible world and make it partially intelligible. Each of these principles is examined in one of the central chapters. Chapter 2 presents the flux problem articulated in the Timaeus and analyzes the Receptacle as a stable underlying medium that enables deictic reference to perceptible particulars. Chapter 3 turns to the Forms as explanatory standards that account for resemblance patterns and support kind-identification in a world of shifting phenomena. Chapter 4 investigates the role of Intelligent Productive Causes—chiefly the Demiurge—as agents who impose the intelligible structure of the Forms onto the Receptacle. Taken together, these principles constitute a metaphysical framework within which perceptible things can be referred to, classified, and explained despite their inherent instability. In this cosmological context, Plato emphasizes how this framework underpins truthful discourse about living beings and the elemental particles that compose them. The conclusion draws out the epistemic implications of this metaphysical and linguistic reconstruction. Plato’s cosmology is a “likely account” (eikōs logos): an account that captures the intelligible structure of the cosmos while acknowledging the limits imposed by human cognition and the cosmos’ status as an “image” (eikōn) of intelligible reality. As an image, the cosmos is only partially knowable, as its full causal history lies beyond the reach of human reason. I conclude that while Plato’s cosmology articulates a viable model of scientific understanding, further research is needed to determine whether it meets the criteria for a fully developed science of nature, a question with significant implications for how we interpret Plato’s legacy in both metaphysics and the philosophy of science.

A paper in The Phronesis Issues preprint series applying the displacement framework. The conventional ordering of plant evolution --- charophyte algae, then non-vascular embryophytes (mosses, liverworts, hornworts), then early tracheophytes (Cooksonia, Rhyniophytes), then lycophytes, ferns, gymnosperms, and finally angiosperms --- is presented in pedagogical and reference contexts as a settled sequence. The actual evidential basis for this ordering is substantially more fragmentary, contested, and inference-laden than the pedagogical presentation suggests. We apply the Displacement Framework's distinction between configurations that are well-supported, partially-supported, and culturally-maintained-but-underdetermined to the case of plant evolution narrative. We introduce a distinction at the centre of the analysis: presumed (inherited through teaching and accepted as default), supposed (actively hypothesised but underdetermined by evidence), and evidenced (constrained by data of sufficient quality). The conventional plant-evolution narrative is a mixture of all three, but the ratio is not what the pedagogical presentation implies. Nine propositions formalise the conventional narrative (P1), the cryptogam-first presumption versus the cryptospore evidence record (P2), the Rhynie chert moment as the rare evidentially-rich window (P3), the bryophyte paraphyly versus monophyly contest (P4), the gymnosperm-angiosperm-Gnetales position uncertainty (P5), the molecular-clock versus fossil-first-appearance discrepancy (P6), the narrative attractor in evolutionary pedagogy (P7), the preservation-bias substrate constraint on the inferential landscape (P8), and the framework's prescription for honest phylogenetic presentation (P9). The paper closes with the observation that the framework's analysis of plant evolution applies more broadly to scientific narrative inheritance: the pedagogical compression of underdetermined claims into settled-sounding sequences is itself a wrong attractor in the epistemic landscape, sustained by the cost of teaching uncertainty relative to the perceived ease of teaching narrative.

This paper examines the relation between Pythagorean and Heraclitean political views. I argue that for Pythagoras, Heraclitus, and Archytas the cosmological and musical notions of harmony (ἁρμονία) and the related notion of concord (ὁμόνοια) have an intrinsic political significance. These thinkers variously reflect upon political harmony and concord, and agree that a crucial condition for it is law (νόμος), which according to Pythagoras and Heraclitus has a divine origin. I begin with the Heraclitean fragments 22 B51, 54, 72, and 114 DK, in which social and political reflection is connected with the theory of the harmony of opposites. In the case of Pythagoras and early Pythagoreanism, the intense, albeit indirect political influence in Magna Graecia—as transmitted by Iamblichus and Porphyry—offers evidence for social and political ideas determined by a reflection on the cosmological role of harmony and number. Finally, Archytas’ political application of rational calculation in fragment 47 B3 DK, which aims at producing concord by establishing the just measures of wealth in the city, together with the testimony on Archytas’ intense and fruitful political activity, can be taken as confirmation that the thinker’s wider cosmological views were indeed intertwined with his political reflection and action.

Book 1 of Plato’s Laws, and particularly the image of the puppet introduced near its end, has been traditionally interpreted as presenting the moral psychology model that underlies the educational system delineated by the Athenian Stranger, which construes virtue as consonance between the non–rational and the rational elements of the soul. But a different and competing conception of virtue looms large in Laws 1, virtue as victory of the best part of the soul in psychic conflict. This paper argues that the Athenian’s conception of education as the correct conformation of originally conflicting psychic forces requires the simultaneous presence of the harmony and the conflict models of virtue in Laws 1. Education is in turn defined by calculation, the rational activity which persuasively leads the conflicting non–rational forces towards a consonant reciprocal rapport. By strategically developing his understanding of education and calculation in Laws 1, the Athenian shows how the harmony model of virtue overcomes the conflict model, while at the same time recognising that there is some truth to the conflict model after all and integrating it within the harmony model.

This paper makes the claim that the overall structure of Plato’s Laws follows the principle of indirect access to the knowledge of human soul, which consists in the understanding that a philosophical approach to the soul is only possible initially through an image of it. The structure of the Laws can be interpreted as a movement towards the soul’s interior, beginning with the famous image of the puppet. According to this image, the movement opens with the analysis of the non-rational elements of the soul, which are capable of an harmonic relation with the rational element, and advances bit to bit to the rational or epistemic element. The political necessity of undertaking the dialectical investigation in order to attain a philosophical knowledge of the human soul and its specific excellence appears only at the end of the dialogue. In this way, the structure of the Laws dramatizes the progressive birth of philosophy, conceived as the dialectical investigation of the unity of virtue, starting from the initial understanding of the human soul contained in the myth of the puppet.