![adjoint functor](http://aether.co.kr/images/adjoint_functor.svg)

I drew out the left and right adjoint functors and the underlying naturality square in one picture because I like to draw diagrams to help me memorize the relationships. This one might be intimidating because there is so much going on but once your eyes adjust to the third dimension its pretty straight forward.

I drew this so that morphisms are lines, functors are planes and natural transformations are cubes.
The naturality square for the natural isomorphism is shown by the green double arrows and the functors as green planes.