The pointing hands
In Raphael's School of Athens, Plato points upward to the heavens and Aristotle gestures down to the earth — and the platform reads the image as capturing a real and lasting division. Aristotle studied at Plato's Academy for some twenty years, absorbed his teacher's vocabulary and questions, and then parted company with him on issue after issue. The platform reads the relation not as a simple opposition (Aristotle remained, in deep ways, a Platonist) but as the West's first great philosophical disagreement — and the source of two enduring tempers of thought.
The forms and the world
The platform reads the deepest division as metaphysical. Plato located true reality in a separate realm of eternal Forms, of which the visible world is only an imperfect copy; knowledge is the soul's ascent to this transcendent reality. Aristotle rejected the separate Forms — "Plato is dear to me, but dearer still is truth" — and located reality in the individual substances of this world, the form embedded in the matter, knowable through the patient study of nature. The platform reads the Metaphysics and On the Soul as the texts of this break: where Plato's soul is an immortal substance imprisoned in the body, Aristotle's soul is the form of the living body, inseparable from it. Heaven against earth, the transcendent against the immanent.
The method of ethics and politics
The platform reads the division as sharpest, for its own concerns, in ethics and politics. Plato sought to ground politics in the theoretical knowledge of the Good and to build the ideal city; Aristotle grounded ethics in the formation of character and the practical wisdom of the experienced person, and grounded politics in the empirical study of how actual constitutions survive and fail. Where Plato asks what is best simply, Aristotle asks what is best for these people in these circumstances. The platform reads this as the division between the idealist and the realist, the utopian and the empiricist, the philosopher who measures the world by the ideal and the philosopher who finds the good achievable within it.
Why the West needed both
The platform reads the lasting lesson as the complementarity of the two. The Western tradition has never been able to do without either — Plato for the height of its aspirations, the vision of a reality and a good beyond the actual; Aristotle for the patient analysis of the actual, the discipline of attending to how things are. The platform reads the two as the perpetual poles of thought, and reads the long alternation between them — Platonism dominant in late antiquity and the Renaissance, Aristotelianism in the high Middle Ages and much of modern science — as the rhythm of Western intellectual history. The structured comparison is at Plato and Aristotle.