Ted Talks has some extremely good discussions that relate to photography. One of my favorite videos there is by Beau Lotto and has to do with how we, as humans, perceive color. We are incapable of visualizing absolute color values, everything that we see is contextual.
Beau demonstrates how our brain compensates for color casts and changes in luminosity to make us see what we expect versus what is actually in front of us. It can be frightening to see how easily the brain is convinced that we are seeing the same color when they are drastically different hues, or different tones when they are exactly the same.
The video is as fun as it is educational.