Illusion designs from friends #2

The copyright of each image belongs to the corresponding creator, to whom contact should be addressed in the case of request for use (even if it is for educational, research or personal use).

since November 24, 2004

Copyright Herman Verwaal 2005
from Herman Verwaal, Exloo, Netherland, October 27, 2005

Akiyoshi's comment: The upper image may depend on the Fraser illusion while the lower one includes anomalous motion illusion.

"Bands of light"

The square appears to be distorted. In addition, we can see an afterimage.

Copyright Keizo Shimizu 2005
from Keizo SHIMIZU, Kobe, Japan, September 28, 2005

Akiyoshi's comment: This geometrical illusion might be explained with our model of the Café Wall illusion (Kitaoka, Pinna and Brelstaff, 2004).

"Eggs of frogs"*

*Nagata illusion

Each row of the larger circles is aligned but appears to distorted toward the positions of the smaller circles.

Copyright Toru NAGATA 2005
from Toru NAGATA,  Tokyo, Japan, September 5, 2005

Akiyoshi's comment: I think this illusion is quite new, though there is a similar illusion called the Giovanelli illusion.

"Capillary vessels"

The image appears to move slightly.

Copyright Keizo Shimizu 2005
from Keizo SHIMIZU, Kobe, Japan, June 14, 2005

Akiyoshi's comment: I feel that this image is op art rather than illusion design.

"Shimizu's tilt checkerboard"

The squares appear to rotate clockwise.

Copyright Keizo Shimizu 2005
from Keizo SHIMIZU, Kobe, Japan, June 13, 2005

Akiyoshi's comment: The illusion magnitude is large.

"Bloch-Gafter's effect"

The four diamonds in each panel have the same gradation (left image), but they appear to be differernt in lightness when combined (right image). In the upper panel, the right or left diamonds appear to be darker than the upper or lower ones. In the lower panel, inversely, the right or left diamonds appear to be lighter than the upper or lower ones.

The basic image: from Josh Bloch and Neal Gafter, Google, USA, June 7, 2005

In: Joshua Bloch and Neal Gafter (in press) Java Puzzlers: Traps, Pitfalls, and Corner Cases. Upper Saddle River, NJ: Addison Wesley.
ISBN 032133678X (to be published in June 29, 2005) Amazon

Akiyoshi's comment: They guessed that this is a varient of the Craik-O'Brien-Cornsweet effect, which I disagree with. In my opinion, this image should be characterized by perceptual transparency.

"Trick Eyes tilt illusion"

If you write "Trick Eyes Trick Eyes Trick Eyes..." in Japanese, the series of words appear to tilt counterclockwise.

Copyright Rie Tamura 2005
from Rie TAMURA, Kanzen (the publisher of Trick Eyes), Japan, June 1, 2005

What is 'Trick Eyes'?

Akiyoshi's comment: It does not work in English.

"Kitchen sponge"

Something appears to scintillate.

Copyright Koichiro Suzuki 2005
from Koichiro SUZUKI, Kawasaki, Japan, May 18, 2005

Akiyoshi's comment: I guess that scintillation is the Bergen illusion. The copyright is restricted to this image becuase it is only a plaid.


The background appears to expand.

Copyright Michiyo Fukada 2005
from Michiyo FUKADA, Fuji Xerox Co.,Tokyo, Japan, March 1, 2005

Akiyoshi's comment: It's the peripheral frift illusion.

"Sumikawa's triangle"

The left triangle appears to be wider in the horizontal direction than the right one, though they are identical in size.

from Aiko SUMIKAWA, one of the undergraduate students in the Department of Psychology, Ritsumeikan University, Japan, December 17, 2004

Akiyoshi's comment: Müller-Lyer illusion plus something?

"Lighting grid illusion"

Illusory colored rays appear to run obliquely.

Copyright Keizo Shimizu 2004
from Mr. Shimizu, Kobe, Japan, December 2, 2004

Akiyoshi's comment: I think this illusion is similar to my "colored ray" illusion.

"An floating eye"

Parts appear to move.

Copyright ENDO Shinichi 2004
from Mr. Endo, Fujimi-shi, Saitama-ken, Japan, November 29, 2004

Akiyoshi's comment: I think this illusion is based upon that of Pinna and Spillmann (2002)*.

*Pinna B, Spillmann L. (2002) A new illusion of floating motion in depth. Perception, 31, 1501-1502.

"Tabata's tilt illusion"

The block of the paragraphs appears to tilt clockwise a little.

Copyright TABATA Takuya 2004
TABATA Takuya (who graduated from the Ritsumeikan University), COE, Kyoto University, Japan, November 24, 2004

Akiyoshi's comment: This image appears to include anomalous motion illusion a little...

Illusion design from friends (the first version)

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