Classic geometrical illusion 20

since February 13, 2016


"A tilt illusion"

Horizontally aligned rows appear to tilt alternately. The uppermost and third rows appear to tilt counterclockwise whereas the rest clockwise.

Copyright Akiyoshi Kitaoka 2017 (February 3)


"Optimized Lipps illusion"

Horizontally aligned rows appear to tilt alternately. The uppermost and third rows appear to tilt counterclockwise whereas the rest clockwise.

Copyright Akiyoshi Kitaoka 2017 (February 4)


"Café Wall illusion with oblique line segments"

Horizontally aligned rows of oblique gray line segments appear to tilt alternately. The uppermost, third and fifth blocks appear to tilt counterclockwise whereas the rest clockwise.

Copyright Akiyoshi Kitaoka 2016 (September 1)


"Wavy Fraser illusion"

Blocks of wavy lines are aligned horizontally, but the uppermost, third and fifth blocks appear to tilt counterclockwise whereas the rest clockwise.

Copyright Akiyoshi Kitaoka 2016 (February 13)

cf.

No illusion when wavy lines are homogeneously black or white.


"Wavy Fraser illusion 2"

Blocks of wavy lines are aligned horizontally, but the uppermost, third and fifth blocks appear to tilt counterclockwise whereas the rest clockwise.

Copyright Akiyoshi Kitaoka 2016 (February 13)


cf.

Fraser illusion


Fraser illusion with slightly curved line segments



"Square-wave Fraser illusion"

Blocks of wavy lines are aligned horizontally, but the uppermost, third and fifth blocks appear to tilt counterclockwise whereas the rest clockwise.

Copyright Akiyoshi Kitaoka 2016 (February 13)


cf.

Illusion of shifted lines

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



"Fraser illusion of triangular waves"

Blocks of triangular waves are aligned horizontally, but the uppermost, third and fifth blocks appear to tilt counterclockwise whereas the rest clockwise.

Copyright Akiyoshi Kitaoka 2016 (February 15)



"Snake subway trains"

Snakes are aligned horizontally, but the uppermost, third and fifth ones appear to tilt counterclockwise whereas the rest clockwise.

Copyright Akiyoshi Kitaoka 2016 (February 15)


Classic geometrical illusion 19

Classic geometrical illusion 18

Classic geometrical illusion 17

Classic geometrical illusion 16

Classic geometrical illusion 15

Classic geometrical illusion 14

Classic geometrical illusion 13

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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