Chromostereopsis
Advancing color and receding color

For many people, the effect is larger when they see the figures with a distance of more than 1 meter.


"The end of the earth"

For more than half people, the red ring appears to be in front of the blue "earth". In addition, they appear to move.

Copyright Akitaoka Kitaoka 2004 (December 29)


"Blinds"

The image appears to be blinds, in which yellow appears in front while blue appears behind.

Copyright Akitaoka Kitaoka 2004 (October 22)


"Vertebral column"

The array of gold rectangles appears to form a column. I am not sure that this effect is really chromostereopsis. In addition, there is lightness illusion in the uniform blue background, which is grating induction.1)

Copyright A.Kitaoka 2004 (July 17)

1) McCourt, M. E. (1982) A spatial frequency dependent grating-induction effect. Vision Research, 22, 119-134.


"Kamaboko"*

*kind of food

For many people, the red is located on the top of the illusory bulges.

Copyright A.Kitaoka 2003


"A black heart"

For more than half people, the black heart appears to be behind the brown surround. In addition, the heart appears to move a little.

Copyright Akitaoka Kitaoka 2005 (March 2)

cf.
Faubert, J. (1995) Colour induced steropsis in images with achromatic information and only one other colour. Vision Research, 35, 3161-3167.
Faubert, J. (1994) Seeing depth in colour: More than just what meets the eyes. Vision Research, 34, 1165-1186.


"Floating heart"*

*The "Trick Eyes" version

For more than half observers, the black heart appears to float in front of the surround. However, some observers see the reversal. In this version, the heart appears to move frequently.

Copyright A.Kitaoka 2002
(c)Akiyoshi Kitaoka "Trick eyes" Tokyo: KANZEN 2002

*I found a similar image in a previous paper, in which the inset was of square shape, the stimuli were random dots, and the background is green and the surround is red. It seems that this paper is always cited in the study of chromostereopsis.
Faubert, J. (1994) Seeing depth in colour: more than just what meets the eyes. Vision Research, 34, 1165-1186


"Chochin"*

*a kind of light

For many people, the red is located on the top of the illusory bulges.

Copyright A.Kitaoka 2003


"Floating heart"

For more than half observers, the red heart appears to float in front of the blue surround (upper panel) while the blue heart appears to sink behind the red surround (lower panel). However, some observers see the reversal. This demonstration depends on chromostereopsis. In addition, the hearts sometimes appear to move.

Copyright A.Kitaoka 2002


"Flattening heart"

The chromostereopsis reduces or disappears when the background is white. Those who see the red heart in front of the blue surround when the background is black ("Floating heart"), tend to see the red BEHIND the blue when the background is white.

Copyright A.Kitaoka 2002


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