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We provide the media, publishers and syndication agencies with percetion and optical illusion contents for recreational, educational or communication purpose:
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corner top left New Optical Illusions Gallery  
 by Gianni Sarcone and Marie Waeber  
   

You can browse throughout the gallery by clicking the navigation arrows or any page number. If you are interested in licensing or syndicating our intriguing perception and optical illusion contents, you will find all usefull info here.
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Sarcone's Crosses Sarcone's Crosses

Relative Size Illusion
This illusion called Sarcone’s Crosses contradicts Ebbinghaus illusion and Obonai square illusion (fig. 2). Sarcone's cross illusion consists of a cross (the test shape) surrounded by sets of squares of distinct size (the inducing shapes). As shown in the diagram opposite (fig. 1), the 2 red crosses are exactly the same size; however, the one on the left (surrounded by large squares, fig. 1.a) tends to appear larger. In Obonai square illusion it is exactly the contrary!



More Archimedes' Lab Illusion Galleries & Stores
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You can use the image above in your non-commercial web page for free as long as you leave the copyright and author's info intact and link to us. You will find here more information regarding the reproduction and licensing rights.

The Authors
Gianni A. Sarcone and Marie J. Waeber, designers and writers, are specialists in creative learning. They create and invent educational manipulatives and thinking games which help teach mathematics, visual and plastic arts. Their maxim is: “be curious first!”. In 2018, they won the prestigious Royal Society's Young People's Book Prize (click here to get more info about the authors).

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