Cool optical illusion - this diamond shape appears to move

By changing the luminance around the edges of the diamond and the background, you can make it look as though the diamond is moving up, down, right, or left. From a paper in i-Perception titled, "The Perpetual Diamond: Contrast Reversals Along Thin Edges Create the Appearance of Motion in Objects."by Oliver J. Flynn and Arthur G. Shapiro. Read the rest