There are a number of illusions like this - a checkerboard with weird colored tubes comes to mind - but this is easily the most dramatic of the effects. Even wh

There are a number of illusions like this - a checkerboard with weird colored tubes comes to mind - but this is easily the most dramatic of the effects. Even when zoomed in, I still see it. http://en.wikipedia.org/wiki/Same_color_illusion http://en.wikipedia.org/wiki/Same_color_illusion