Color illusion III
Since December 6, 2005
"info"
The left 'i' and the right 'i' are identical gray, but the former appears to be yellowish while the latter appears to be bluish.
Copyright Akiyoshi Kitaoka 2006 (June 26)
"Packed illusory red rings"
This image is painted only with cyan (greenish blue) pixels of different luminance and different saturation, but illusory red rings are observed.
Copyright Akiyoshi Kitaoka 2006 (June 26)
Color contrast? Color constancy? Land's two-color method? Goethe's color shadow phenomenon?
"Illusory red ring"
This image is painted only with cyan (greenish blue) pixels of different luminance and different saturation, but an illusory red ring is observed.
Copyright Akiyoshi Kitaoka 2006 (June 26)
Color contrast? Color constancy? Land's two-color method? Goethe's color shadow phenomenon?
"Three tanks"
There are two squares of the same color. Which are they? Answer
Copyright Akiyoshi Kitaoka 2006 (May 1)
"Four tanks"
There are two pairs, each of which consists of two squares of the same color. Which are the two pairs? Answer
Copyright Akiyoshi Kitaoka 2006 (May 1)
"Spirochetes"
There appear two kinds of "spirochetes" of slightly different reds though they are identical. Moreover, more than half observers may see the "orange" spirochetes in front of the rest when watching from more than 1 meter apart (20% may see the reversal).
Copyright Akiyoshi Kitaoka 2006 (April 12)
"Orange snakes and magenta snakes"
The central curves of the left snakes appear to be orange while those of the right ones appear to be magenta (light red-purple).
Copyright Akiyoshi Kitaoka 2006 (April 6)
"Earth and moon"
The upper circle appears to be bluish while the lower one appears to be yellowish. Actually, they are of the same color gradation. In addition, the former appears to move leftward while the latter appears to slide rightward.
Copyright Akiyoshi Kitaoka 2005 (December 9)
"Red flowers"
There appear to be magenta (light red-purple) flowers and orange ones, though the red is identical.
Copyright Akiyoshi Kitaoka 2005 (December 8)
Color contrast + color assimilation + Munker illusion + surface completion?
"Searchlight"
There appears to be searchlight. The circles within each column are the same in color gradation, but the upper two appear to be yellow circles while the lower two appear to be blue ones.
Copyright Akiyoshi Kitaoka 2005 (December 6)
"Yellow moon and blue moon"
There appear to be a yellow circle and a blue one, though they are of the same color gradation.
Copyright Akiyoshi Kitaoka 2005 (December 6)
Answer of "Three tanks": the middle square and the right one
Answer of "Four tanks": the pair of the leftmost square and the neighboring one, and the pair of the rightmost square and the neighboring one