Classic geometrical illusion 12

since November 19, 2009


"Road size illusion"

The upper road appears to be larger than the lower one, though they are the same size.

Copyright Akiyoshi Kitaoka 2009 (December 28)


"Suzukasutera"

Suzukasutera = a snack

The vertical lines appear to tilt alternately.

Copyright Akiyoshi Kitaoka 2009 (December 24)


"Coal mine"

The concentric squares appear to be distorted.

Copyright Akiyoshi Kitaoka 2009 (December 21)


"Fraser illusion witout obliques"

The uppermost and the third rows appear to tilt counterclockwise while the rest clockwise.

Copyright Akiyoshi Kitaoka 2009 (December 17)

I imagine this demonstration is an intermediate one between the Fraser illusion and Popple illusion.


"Overestimation of eyes induced by eyelids and eyelashes"

Eyes with eyelids and eyelashes appear to be larger than those without them.

Copyright Akiyoshi Kitaoka 2009 (December 12)


"Double-decker roads"

The upper road appears to be larger than the lower one, though they are the same size.

Copyright Akiyoshi Kitaoka 2009 (December 4)



"Serbian tilt illusion"

The first, third and fifth rows of Latin letters appear to tilt counterclockwise, while the second and fourth rows of Cyrillic letters clockwise. This image is probably the first of the tilt illusion using Serbian letters.

oqoa = oboe, taketa = an artificial word Köhler used, zvezda = star

Copyright Stevanov, J. 2009 (November 24)
from Jasmina, Department of Psychology, Ritsumeikan University


"Konshinkai (banquet) tilt illusion"

If the Chinese characters meaning the "banquet" are repeated, the row appears to tilt clockwise.

Copyright Akiyoshi Kitaoka 2009 (November 26)

Professor Hitoshi ARAI, University of Tokyo has discovered the tilt illusion of mathematical formulas this month!


"Naname sakushi (oblique illusion)"

If the Chinese character meaning "oblique" are repeated, the row appears to tilt clockwise. I imagine this illusion depends on the Zöllner illusion.

Copyright Akiyoshi Kitaoka 2009 (November 19)

Professor Hitoshi ARAI, University of Tokyo has discovered the tilt illusion of mathematical formulas this month!


"Keisha sakushi (tilt illusion)"

If the Chinese characters meaning the "tilt illusion" are repeated, the row appears to tilt clockwise.

Copyright Akiyoshi Kitaoka 2009 (November 19)

Professor Hitoshi ARAI, University of Tokyo has discovered the tilt illusion of mathematical formulas this month!


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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