Color Contrast

[Strela]

Here's an example of what color contrast can do:

http://blogs.discovermagazine.com/badastronomy/files/2009/06/colors.gif

Think there are four colors?

There are really only three. Eyedropper 'em and find out. It's an illusion based on adjacent color contrasts.

[JJacks]

I had to do some of these in color theory. It's really amazing to see how colors when you place certain ones together.

[CCThrom]

That's pretty cool... the "green" and the "cyan" are actually the same color...