This image has no color, right?  Mouseover the picture and stare intently at the colored boxes. There's no need to focus on any particular spot, just look at the boxes for a few minutes.  Move your mouse away and look at the first image again. The horizontal gratings will look greenish and the vertical gratings pink.  That's not especially impressive, but come back tomorrow and the effect will still occur. It's not a simple afterimage. Print out the black and white grid and carry it around with you. Rotate it and see what happens.

No one's sure what's behind this sensory phenomenon; some think it temporarily modifies the cells in the visual cortex that respond to color and orientation.

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