1. Collection of Optical Illusions:
Geometrical-Optical Illusions

Hering's Optical Illusions | Ehrenstein's Optical Illusions | Meyer's Optical Illusions | Zöllner's Optical Illusions | Müller-Lyer's Optical Illusions | Poggendorf's Optical Illusions

 

Hering's Optical Illusions

The slanted lines cause the illusion that the blue lines are not parallel. In fact they are! Place your mouse pointer over the image in order to envision the illusion!


 

The slanted lines cause the illusion that the blue lines are not parallel. In fact they are!

 

The circles make the blue squares seem distorted The circles make the blue squares seem distorted Place your mouse pointer over each image in order to envision the illusion!

The circles make the blue squares seem distorted.

 

You probably perceive the middle lines as bowing out slightly. In fact they are parallel! Place your mouse pointer over the image in order to envision the illusion!


 

You probably perceive the middle lines as bowing out slightly. In fact they are parallel!

 

Ehrenstein's Optical Illusions

Ehrenstein's Optical Illusions Place your mouse pointer over the image in order to envision the illusion!


 

Slanted lines make the blue square seem distorted.

 

Meyer's Optical Illusions

Meyer's Optical Illusions Place your mouse pointer over the image in order to envision the illusion!


 

The center shape is in fact a circle.

 

Zöllner's Optical Illusions

Zöllner's Optical Illusions Zöllner's Optical Illusions Place your mouse pointer over each image in order to envision the illusion!

Parallel lines intersected by a pattern of short diagonal lines appear to diverge.
Explanation: the brain is attempting to interpret this image as if it were part of a three-dimensional scene.

Parallel bars illusion Place your mouse pointer over the image in order to envision the illusion!

A variant of Zöllner's optical illusion based on parallel bars. Note that the strength of the illusion depends on the pattern, especially on the slope of the diagonal pattern lines.

 

Müller-Lyer's Optical Illusions

Müller-Lyer's Optical Illusions Place your mouse pointer over the image in order to envision the illusion!


 

Probably the most famous and most studied illusion was created by German psychiatrist Franz Müller-Lyer in 1889.

Although your eyes tell you that the left horizontal line is longer than the right one, they are equal in length.

 

Poggendorf's Optical Illusions

Poggendorf's Optical Illusions Place your mouse pointer over the image in order to envision the illusion!


 

The single line if continued joins with the lower of the pair, not the top.

 

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Source:  Optical Illusions