Some of Plato and Aristotle's thoughts are connected to "art and aesthetics". Even though both of them doesn't made any theory on art.One great example is that both Philosophers first established the essential perceptions like "form and content", and on their dissertation about "imitation" or "mimesis". Also, some of the important opposite views of Plato and Aristotle was that Plato always points out that imitation must only be focused on forms of ideas that dominates the universe, that are also exposed in the "order, harmony, and balance" of our real
world.
(Plato and Aristotle on Beauty and Imitation by classical art history@suite 101)