Pyramid Illusion

So one of the coolest things I've seen in a while is this pyramid optical illusion. Stare at the dot in the center of the pyramid, and eventually it will switch over to a black & white image of the same thing. The cool part is that when it changes at first, you should see the pyramids in color, when they are actually in black & white!

I learned about this concept in my Geography 416A class yesterday when we were watching a video on how vision is not just seeing one color or another, but is actually the mind constantly learning about new perceptions of hue, brightness, darkness, etc. In this picture, you "learn" that the pyramid picture is in color, so when presented with the same exact shape or pattern but black and white, your eyes initially interpret it in color. Cool huh!?