Classic geometrical illusion 18

since March 12, 2012


"Ebbinghaus illusion-like thickness illusion"
ver. 2013

In each row, the right circle surrounded by thinner circles appears to be thicker than the left circle surrounded by thicker circles, though they are the same in thickness.

Discovered by Akiyoshi Kitaoka 2013 (February 25)



"FILE tilt illusion"

Letters are aligned vertically or horizontally, but F and L appears to tilt counterclockwise while I and E clockwise.

Copyright Akiyoshi Kitaoka 2013 (February 5)

Applied illusions

1. Zöllner illusion

2. Illusion of oblique edges (the edge version of the Fraser illusion)



"Open tilt illusion"

Letters are aligned vertically or horizontally, but o and e appears to tilt counterclockwise while p and n clockwise.

Copyright Akiyoshi Kitaoka 2013 (February 5)



"Octopus"

Vertical or horizontal gray lines appear to tilt.

Copyright Akiyoshi Kitaoka 2013 (January 20)



"Kawara senbei"

*Kawara senbei = kind of hard cookies

Horizontal rows of kawara senbei appear to tilt counterclockwise.

Copyright Akiyoshi Kitaoka 2012 (December 5)



"Cabé Wall illusion"

*Cabé (kabe) = wall (in Japanese)

Horizontal rows of black and white stripes appear to tilt alternately. The uppermost row appears to tilt clockwise.

Copyright Akiyoshi Kitaoka 2012 (December 1)

This is a vatiation of the Montalvo illusion (Lavatory Wall illusion).



"Plesiosaurs"

Horizontal rows appear to tilt alternately (illusion of fringed edges) and move horrizontally (optimized Fraser-Wilcox illusion Type I).

Copyright Akiyoshi Kitaoka 2012 (September 22)



illusion of fringed edges

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



"64 plesiosaurs"

Vertical rows as well as horizontal rows appear to tilt counterclockwise.

Copyright Akiyoshi Kitaoka 2012 (September 23)




"Chochin"
(a remake)

Circles of the same size appear to be different in size. The leftmost, the middle and the rightmost circles appear to be larger than the rest.

Copyright Akiyoshi Kitaoka 2012 (June 8)



-------------------------------------

"Chochin"*

*kind of lamps

Circles of the same size appear to be different in size. If you put the cursor on the figure, the oblique lines disappear and the circles appear to be the same in size

Copyright A.Kitaoka 1999

http://www.psy.ritsumei.ac.jp/~akitaoka/classice.html


"Fraser diamonds"

Diamond shapes appear to be distorted according to the Fraser illusion.

Copyright Akiyoshi Kitaoka 2012 (June 5)


"Ninja"

The three circles in a row in the center are of the same size, but the middle one appears to be smaller than the rest.

Copyright Akiyoshi Kitaoka 2012 (April 6)


"Perspective Poggendrff illusion"

The uppermost line of the left wall is aligned with the lowermost line of the right wall, but the former appears to be placed upper than the latter. In the same way, the uppermost line of the right wall is aligned with the lowermost line of the left wall, but the former appears to be placed upper than the latter. In addition, the cylinder in front appears to be smaller than the other though they are teh same size (corridor illusion).

Copyright Akiyoshi Kitaoka 2012 (March 11)

The distortion is reversed if perspective patterns are given to the ceiling and floor.


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


Top page