Classic geometrical illusion 11

since July 15, 2009


"Hay rolls"

The three hay rolls project the same retinal size, but the leftmost one appears to be the largest and the rightmost one the smallest.

Copyright Akiyoshi Kitaoka 2009 (August 24)

photo August 21, 2009, in Hokkaido, Japan


"Blocks of ham"

The two blocks of ham project the same retinal size, but the left one appears to be larger than the right.

Copyright Akiyoshi .Kitaoka 2008 (July 16)


"Kamigamo-shrine Ponzo illusion"

The upper line segment appears to be longer than the lower one, though they are the same size.

Copyright Akiyoshi Kitaoka 2009 (August 22)

photo November 29, 2006



Ponzo illusion

The upper line segment appears to be longer than the lower one, though they are the same size. The left circle appears to be larger than the right one, though they are the same size.


"JPA 2009 okoto Ponzo illusion"

The left person appears to be larger than the right one, though they are the same size.

Copyright Akiyoshi Kitaoka 2009 (August 11)


"JPA 2009 Ponzo illusion"

The left person appears to be larger than the right one, though they are the same size.

Copyright Akiyoshi Kitaoka 2009 (July 27)


"Photo tilt illusion"

Horizontal borders appear to tilt counterclockwise.

Copyright Akiyoshi Kitaoka 2009 (July 27)



The basic illusion, a variation of the Cafe Wall illusion




The limiting cases of the Cafe Wall illusion (Kitaoka, Pinna and Brelstaff, 2004)


References

Kitaoka, A., Pinna, B., and Brelstaff, G. (2004). Contrast polarities determine the direction of Café Wall tilts. Perception, 33, 11-20. PDF

Kitaoka, A. (2006) Configurational coincidence among six phenomena: A comment on van Lier and Csathó (2006). Perception, 35, 799-806. PDF animations

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

van Lier, R. and Csathó, Á. (2006) Dancing shapes: A comparison of luminance induced distortions. Perception, 35, 775-798.



"Unstable girl"

Rectangles appear to be trapezoids.

Copyright Akiyoshi Kitaoka 2009 (July 27)



"Unstable girl 2"

Rectangles appear to be trapezoids.

Copyright Akiyoshi Kitaoka 2009 (July 27)


"Spider's web illusion"

Each segment of circular threads appears to bend inward.

Copyright Akiyoshi Kitaoka 2009 (July 24)

References

Kitaoka, A. (1997) An overview of visual illusions. VISION, 9, 131-162. PDF (Figure 23D)


"Gregory's table illusion"

The two parallelograms are the same in shape, but in the left one the right and left sides appear to taper downward while in the right one they appear to taper upward.

Copyright Akiyoshi Kitaoka 2009 (July 15)

References

"a top-down distortion"

Gregory, R. L. (1998) Eye and Brain, the fifth edition Oxford University Press. (pp. 232)


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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