The latest works 19

since July 13, 2006


"Illusion buildings"

Motion illusion: In the left building, the upper half appears to move leftward while the lower half rightward. The reversal appears in the right building.

Position illusion: The blue windows are aligned vertically, but in the left building the ones in the upper half appear to be slightly shifted rightward as compared with those in the lower half. The reversal appears in the right building.1)

Binocular stereopsis: When fusing the two buildings, cross-fusers see the lower half in front of the upper half. The reversal is observed for uncross-fusers.1)

Copyright Akiyoshi Kitaoka 2006 (August 9)

1)Gregory R L, Heard P F, 1983 gVisual dissociations of movement, position, and stereo depthh Quarterly Journal of Experimental Psychology 35A 217-237


"Psychology tilt illusion"

Letter-rows of "psychology" appear to tilt counterclockwise irrespective of whether they are written in English (upper image) or in Japanese (Chinese characters) (lower image).

Copyright Akiyoshi Kitaoka 2006 (August 7)


"Rotating sleeping girls"

Rings appear to rotate.

Copyright Akiyoshi Kitaoka 2006 (August 5)


"Rotating minimun animation"

Expressions appear to change though this animation consists of only two frames, as shown below.

Copyright Akiyoshi Kitaoka 2006 (August 1)


"Face mirror-image illusion"

Which is the mirror image of face A? Answer

Copyright Akiyoshi Kitaoka 2006 (August 1)


"Sleepiness"

Stripes appear to contract. In addition, the stripes are physically vertical but those in the left half appear to tilt cockwise while those in the right half counterclockwise (Dakin et al., 1999).

Copyright Akiyoshi Kitaoka 2006 (July 24)

Reference

Dakin, S. C., Williams, C. B., & Hess, R. F. (1999) The interaction of first- and second-order cues to orientation. Vision Research, 39, 2867-2884.

<updated September 25, 2012>


"Sakushi hakken! Kakenhi kofu"

Some rows appear to tilt counterclockwise while the others clockwise. These Chinese characters mean "Discovery of illusion! Grant is awarded".

Copyright Akiyoshi Kitaoka 2006 (July 22)


"Umbrellas"

Umbrellas appear to expand. Moreover, the sides of each octagon appear to curve into the center though they are straight.

Copyright Akiyoshi Kitaoka 2006 (July 18)


"Expanding pyramid"

The image appears to move.

Copyright Akiyoshi Kitaoka 2006 (July 14)


"Space colony"

The image appears to move.

Copyright Akiyoshi Kitaoka 2006 (July 14)


Answer of the question in "Face mirror-image illusion"

The mirror image of face A is face B, though faces C-E may tend to be selected.

cf. Thatcher illusion


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