✚ Śunyata darśana: Diogenes enlightens Plato on the essential nature of emptinesspic.twitter.com/CvaOgwJjTw
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My dim recollection is that Plato’s Forms/Ideals were not meant to be understood as functions. That came in more with Aristotle? For Plato, a cup is a cup because it has cupness, not because it holds wine.
If a non-cup holds wine, and you use it as a cup, it’s not a cup, and you are probably a pervert. My friend Beth Preston did a lot of work to sort this out: https://amzn.to/2GdQve2
For Aristotle, functions inhered in objects; i.e. the function of holding wine is an essential property of a cup. And, as you suggest, that function is eternal in the abstract, although its instantiations in particular cups is impermanent.
I'm not an expert on Plato either. But what exactly is 'cupness' without function? My reasoning is that when we see a cup, we recognize it a such because we recognize its function.
A cup that’s developed a hole in it is still a cup; just a defective one.
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