Optical illusions

They look askew, but these lines are perfectly parallel. This effect is called the cafe wall illusion.

Optical illusions
Fibonacci/Wikicommons

Where is the beginning, where is the end? Where is the interior, or is the exterior? 

Optical illusion
OpenClips/Pixabay

Difficult to understand the meaning of this figure and in particular to know exactly what is in the foreground.

Optical illusions
OpenClips/Pixabay

Intersecting white lines on a black background. And like an impression of seeing their intersections become intoxicated. 

Optical illusions
[PublicDomainPictures/Pixabay]

 A 3D impression emerges from this image. The circle in the center appears to be in the foreground.

Optical illusions
[rupertrussell1/Pixabay]

Two face-to-face faces or a vase? Both.

Optical illusions

The arrangement of all the elements is such that it looks like a white triangle stands out. This effect is called Kanizsa Pattern.

Fixing the dot in the center gives the impression that the two circles around it move.

move.[OpenClips/Pixabay]

What do you see ? A rabbit or a duck? Or maybe both.

Optical illusions
[Fastfission/Wikicommons]

The alternation of patterns gives the impression of seeing curved lines. But this is not the case.

Optical illusions
[OpenClips/Pixabay]