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Illusion images, formerly known as color illusions, is a category of Image games in Dan-Ball. Illusion images use the effect of an negative afterimage, or ghost image to colorize a normal black and white image. This afterimage illusion is used in combination with the normal black and white image to colorize it.

The player stares for about 30 seconds at a fixed black point in the center of a negative of the image's colors. The cone cells in the retina of the human eye get overstimulated and lose sensitivity. When looking on a blank surface, these cone cells remain sending out a weaker signal in contrast to the cone cells which were not affected. Therefore, a negative color image appears.

List of color illusions[]

Icon Name Description Date Implemented
Illusion Sakura SAKURA Flowers. 13/05/2007
Illusion Horyuji2 HORYUJI2 Pagoda in a park. 30/04/2007
Illusion Crocus Crocus Some Crocuses. 15/04/2007
Illusion Horyuji HORYUJI Pagoda in the meadow. 06/04/2007
Illusion Goryu GORYU Mountains. 25/03/2007
Illusion Chishimagityou CHISHIMAGITYOU Flowers. 04/03/2007
Illusion Stroll Stroll A building and a tree. 18/02/2007

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