Classic geometrical illusion 13

since December 29, 2009



"Sunrise and sunset"

Horizontally aligned rows of half circles appear to tilt counterclockwise, clockwise, counterclockwise, clockwise.

Copyright Akiyoshi Kitaoka 2010 (July 8)



"Sunrise and sunset 2"

Horizontally aligned rows of half circles appear to tilt counterclockwise, clockwise, counterclockwise, clockwise.

Copyright Akiyoshi Kitaoka 2010 (July 8)



"Ring thickness illusion"

The outer the ring, the thinner it appears to be.

Copyright Akiyoshi Kitaoka 2010 (May 8)



"Microelectrodes"

The right oblique is aligned with the left one, but the former appears to locate upper. This illusion is a combination between the Poggendorff illusion and Morinaga misalignment illusion.

Copyright Akiyoshi Kitaoka 2010 (April 10)



"Metal Wall illusion"

Horizontally aligned rows appear to tilt alternately. From the top, counterclockwise, clockwise, and so on.

Copyright Akiyoshi Kitaoka 2010 (April 3)

Kitaoka, A. (2007) Tilt illusions after Oyama (1960): A review. Japanese Psychological Research, 49, 7-19 PDF



"Derby man tilt illusion"

Horizontally aligned rows of "derby men" appear to tilt alternately. From the top, counterclockwise, clockwise, and so on.

Copyright Akiyoshi Kitaoka 2010 (March 21)



"Saturn tilt illusion"

Horizontally aligned rows of Saturns appear to tilt alternately. From the top, counterclockwise, clockwise, and so on.

Copyright Akiyoshi Kitaoka 2010 (March 21)



"Saturn tilt illusion at night"

Horizontally aligned rows of Saturns appear to tilt alternately. From the top, counterclockwise, clockwise, and so on.

Copyright Akiyoshi Kitaoka 2010 (March 21)



"Lens Giovanelli illusion"

The two lenses are aligned horizontally but the left one appears to be lower than the right.

Copyright Akiyoshi Kitaoka 2010 (March 13)



"Gravity-'lens' illusion"

Each of the four lenses are aligned at each of the apexes of a parallelogram but the configuration appears to be distorted in the upper image.

Copyright Akiyoshi Kitaoka 2010 (March 13)

Naito, S. and Cole, J. B. (1994) The gravity lens illusion and its mathematical model. in G. H. Fischer and D. Laming (Eds.), Contributions to Mathematical Psychology, Psychometrics and Methodology. New York: Springer-Verlag.



"Communication among egges"

Horizontal row of line segments appear to tilt alternately.

Copyright Akiyoshi Kitaoka 2010 (January 11)



"Hourglass"

Horizontal line segments appear to tilt.

Copyright Akiyoshi Kitaoka 2009 (December 29)


Classic geometrical illusion 12

Classic geometrical illusion 11

Classic geometrical illusion 10

Classic geometrical illusion 9

Classic geometrical illusion 8

Classic geometrical illusion 7

Classic geometrical illusion 6

Classic geometrical illusion 5

Classic geometrical illusion 4

Classic geometrical illusion 3

Classic geometrical illusion 2

Classic geometrical illusion 1


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