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Ehrenstein illusion:

The article that introduced this illusion for the first time: 
 

1 Använt.jfif

Kanizsa figures:

The article that introduced this illusion for the first time: 
 

3 Använt.jfif

Illusory volumes - Cylinder:

Contour-curvature induce the volumetric illusion. [link]​​

2 Använt.jfif
fdfdz.jpg

                 Demo 1:             

                 Demo 2:             

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