representable functors

A nugget of insight about representable functors from The Catsters, episode Representables and Yoneda 3, around minute 1:00.

as it turns out, these are very very closely controlled, there's very little that they can do and they are completely controlled by very small amounts of data [...] we think that a lot is going on, when in fact we have very little choice in what's going on, and everything that's going on everywhere is just controlled by one really small bit