The Infinite Regress Illusion

Fixate the black fixation point on the far left side of the image. Note that the figure appears to move steadily away from the fixation point, even though it is in fact only moving up and down.

Fixate the central fixation spot. Notice that the two balls on the left and right appear to be bouncing toward fixation, even though they are in fact remaining at a constant distance from the fixation point. Best viewed on a large screen.