The latest works 13

Access since March 3, 2006

"Star in sakura"

There appears to be a bright star in the center of the sakura (cherry) blossum.

Copyright Akiyoshi .Kitaoka 2006 (March 20)

Illusion of lightness


Worms appear to move horizontally.

Copyright Akiyoshi .Kitaoka 2006 (March 16)

See "Moving white" shown below.

"Moving white"

White squares appear to move. The direction is leftward in the upper and lower rows while it is rightward in the middle one. All squares are identical.

Copyright Akiyoshi .Kitaoka 2006 (March 16)

See the "Illusory staircase Gelb effect" shown below.

"Illusory staircase Gelb effect"

The rightmost square appears to be white.

Copyright Akiyoshi .Kitaoka 2006 (March 15)

Manual version for lectures

The Gelb effect refers to a phenomenon that in a homogeneously dark room an intensely lit black card appears to be gray or white. The card suddenly appears to be black when another white card is placed in the visual field (= lightness constancy).

The staircase Gelb effect is the striking demonstration of the Gelb effect exhibited by Professor Alan Gilchrist, Rutgers University. He used five cards of different luminances in the invited lecture held in Tokyo (March 14, 2006).  Related lecture 

Cataliotti J and Gilchrist A (1995) Local and global processes in surface lightness perception. Perception and Psychophysics, 57, 125-135.

Gilchrist A, Kossyfidis C, Bonato F, Agostini T, Cataliotti J, Li X, Spehar B, Annan V, Economou E.. (1999) An anchoring theory of lightness perception. Psychological Review, 106, 795-834.

"Crime prevention lights"

White circles appear to scintillate.

Copyright Akiyoshi .Kitaoka 2006 (March 9)

cf. scintillating grid illusion

Op art 2

"Ten golden squares"

The ten squares are of the same color but appear to be different from each other.

Copyright Akiyoshi .Kitaoka 2006 (March 7)

Lightness illusion 2

"Unstable chessboard"

The chessboard appears to sway.

Copyright Akiyoshi .Kitaoka 2006 (March 6)

Motion illusion 7

"Bamboos and cherry blossums"

Rows appear to move rightward or leftward.

Copyright Akiyoshi .Kitaoka 2006 (March 6)

Kyoto illusion design 2


*Oze-numa = a highland lake in Japan

There appears mist on the surface of a lake.

Copyright Akiyoshi .Kitaoka 2006 (March 3)

Visual completion

12 The latest works (February 2006 - February 2006)
11 The latest works (February 2006 - February 2006)
10 The latest works (January 2006 - February 2006)
9 The latest works (November 2005 - December 2005)
8 The latest works (October 2005 - October 2005)
7 The latest works (September 2005 - October 2005)
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