There's this notion of a platonic ideal form that whether you're talking about a circle or a ball or a dog or a chair, that there's an ideal form that is independent of what your senses are telling you or what the chair in front of you might be. But that's an imperfect version of that ideal form. The word platonic in general, you'll hear, applied to many different concepts, some of the meanings having changed over time. The other thing that Plato is famous for is the notion of an academy, the place where he taught his students was a little field outside the walls of Athens named for the Athenian hero Akademos. And so that area became known as Plato's Academy. And ever since then, places of learning have often been referred to as academies, just like Khan Academy. But Plato was also concerned, like his teacher Socrates, with the nature of how we should be ruled.