The latest works 26

since June 9, 2007

Attention: There is a design which includes an op effect depending on nearly isoluminant colors.


"Gabor patch drift illusion"

The inner square region appears to move. This is a translational representation of the Gurnsey-Morgan illusion.

Copyright Akiyoshi Kitaoka 2007 (August 6)

Gurnsey-Morgan illusion: Each ring appears to rotate when observers approach or move away from the image keeping their eyes fixed at the center. This illusion was proposed by Morgan (2002) and Gurnsey, Sally, Potechin and Mancini (2002). Gurnsey et al. (2002) claimed that this illusion is the optimised version of the Pinna illusion (Pinna-Brelstaff illusion). The image shown above is my reproduction of their images (Morgan's Exner image or Gurnsey et al's Figure 3) with some minor changes; the originals show stronger illusion than mine.

Gurnsey, R., Sally, S. L., Potechin, C., and Mancini, S. (2002) Optimising the Pinna-Brelstaff illusion Perception, 31, 1275-1280.
Morgan M, 2002 ``Running rings around the brain'' The Guardian Thursday, 24 January 2002; http://www.guardian.co.uk/Archive/Article/0,4273,4341518,00.htmlhttp://www.staff.city.ac.uk/~morgan/TheWheel.pdf

Pinna illusion (strong version): Each ring appears to rotate when observers approach or move away from the image keeping their eyes fixed at the center. This illusion was proposed by Pinna and Brelstaff (2000). The image shown above is my reproduction of their Fig. 5 with some minor changes.

Pinna, B. and Brelstaff, G. J. (2000) A new visual illusion of relative motion. Vision Research, 40, 2091-2096

"Box diverging illusion 2"

Three boxes are identical in the retinal image. Box B appears to point more right than Box A, while Box C appears to point upper than Box B. Yet, Box C does not appear to point more right or upper than Box A. In addition, Box C appears to be larger than Box A.

Copyright Akiyoshi Kitaoka 2007 (July 15)

This effect should share the same machanism as that of "The Leaning Tower Illusion".


"Box diverging illusion"

The right box appears to point more right than the left one, though they are identical images.

Copyright Akiyoshi Kitaoka 2007 (July 14)

This effect should share the same machanism as that of "The Leaning Tower Illusion".


"Reversed spiral illusion"

It appears that concentric circles appear to be spirals, which rotate counterclockwise to approach the center. Here, the illusion is that there are not concentric circles but a spiral which rotate clockwise to approach the center. Thus, this illusion design shows the illusion of the spiral illusion.

Copyright Akiyoshi Kitaoka 2007 (June 26)

The spiral illusion of the Zöllner illusion:

Kitaoka, A., Pinna, B., and Brelstaff, G. (2001). New variations of spiral illusions. Perception, 30, 637-646.


"Spiral blood vessel"

Red concentric rings appear to be spirals.

Copyright Akiyoshi Kitaoka 2007 (June 26)

The spiral illusion of the Fraser illusion (Fraser spiral):

Fraser, J. (1908) A new visual illusion of direction. British Journal of Psychology, 2, 307-320.

The Fraser illusion of this type:

Skillen, J., Whitaker, D., Popple, A., and McGraw, P. V. (2002) The importance of spatial scale in determining illusions of orientation. Vision Research, 42, 2447-2455.


"Dragon ring"

The rings appear to rotate when observers approach or move away from the image keeping their eyes fixed on the center. Moreover, red part appears to wander.

Copyright Akiyoshi Kitaoka 2007 (June 25)


"Rings of rain"

The rings appear to rotate when observers approach or move away from the image keeping their eyes fixed on the center. Moreover, the inner two rings appear to be spirals.

Copyright Akiyoshi Kitaoka 2007 (June 23)

cf. Ouchi illusion, Pinna-Brelstaff illusion, Fraser illusion, Popple illusion (phase-shift illusion)


"Neon watercolor effect"

The square ring area (or corridor) appears to be slightly tinted blue.

Copyright Akiyoshi Kitaoka 2007 (June 22)

Watercolor effect (watercolor illusion):

Pinna, B., Brelstaff, G., and Spillmann, L. (2001) Surface color from boundaries: a new ewatercolorf illusion. Vision Research, 41, 2669-2676.


"Shepard illusion with Rotating snakes"

The left lady appears to be slimmer than the right one, though they are identical to each other. This apparent difference depends on the Shepard illusion, one of the most striking geometrical illusions. The Shepard illusion refers to the apparent difference in shape or size between the left and right parallelograms (physically the same shape or size) on that the ladies are drawn.

Copyright Akiyoshi Kitaoka 2007 (June 20)

Shepard illusion or table-top illusion:

Shepard, R. N. (1990) Mind sights: original visual illusions, ambiguities, and other anomalies, with a commentary on the play of mind in perception and art. New York: Freeman.


"Angular circles"

Green circles appear to be angular. By placing the cursor on the image, you can confirm the shape of circles. The effect is strong when the viewing distance is large.

Copyright Akiyoshi Kitaoka 2007 (June 9)

   

 


"Rotating faces"

The upper-left and lower-right disks appear to rotate counterclockwise while the rest clockwise.

Copyright Akiyoshi Kitaoka 2007 (June 9)


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