Optical Illusions

reversible cube

Reversible Images

cube - reversed

Reversible Images

lines
The black lines are actually straight and parallel to one another

lines
The blue lines are straight and parallel to one another

squares
Varying the space between the squares creates the illusion of three-dimensional space.

more squares
Repeated patterns of this type are frequently used to create op-art images.

rectangle over blue and gray background
The dark gray rectangle appears uniform in color set against two different backgrounds

split in half
Separating the two backgrounds with a line creates the illusion that the dark gray rectangle has two tones

circles

more circles within circles

still more circles

By varying the uniformity of the spacing between these circles, they are made to appear three-dimensional.


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