Few days ago I showed you the winning optical illusion of the 2009 illusion contest. As I promised, here is another one that won the second place in the same contest. The illusion you see has some ghostly colors. When you stare at a waterfall for a few minutes, and look away, the still world around you appears to flow. The effect is called an “afterimage.”. Well, being aware of this phenomena, scientists in Israel created a drawing of a sky with clouds that flashes red for a split second. A white dove flying across the sky seems to turn red seconds after the flash, showing that an afterimage color can linger in our vision and bleed into empty spaces.
You are free to play with the color backgrounds, switching them when you wish. After the colored background disappears, our little birdie remains colored. I’d like to thank Jerry Carpenter for sending me this one.