All metaphysics including its opponent positivism speaks the language of Plato. The basic word of its thinking, that is, of his presentation of the Being of beings, is eidos, idea: the outward appearance in which beings as such show themselves. Outward appearance, however, is a manner of presence. No outward appearance without light -- Plato already knew this. But there is no light and no brightness without the opening. Even darkness needs it. How else could we happen into darkness and wander through it? - Martin Heidegger, On Time And Being
Leonardo da Vinci anatomical drawings
