For the first illusion, stare at the black dot. Eventually, the moving bar at the left side will appear to change color from grey to blue.
For the second illusion, point at the white page
background and concentrate on the blue square for several seconds. Without
moving your eyes, move the mouse pointer onto the square, which will change
color. Initially, the rectangle will appear to be white just like the
background, or as even a brighter white. After a few seconds it will "fade"
to be the grey it truly is. This seems to work better if the window
Entry first conceived on 7 November 2005, 19:12 UTC, last modified on 15 January 2012, 3:46 UTC
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