Optical Illusion

An optical illusion (also called a visual illusion) is characterized by visually perceived images that differ from objective reality. The information gathered by the eye is processed in the brain to give a percept that does not tally with a physical measurement of the stimulus source. There are three main types: literal optical illusions that create images that are different from the objects that make them, physiological ones that are the effects on the eyes and brain of excessive stimulation of a specific type (brightness, tilt, color, movement), and cognitive illusions where the eye and brain make unconscious inferences. They can also be known as "mind games". These are some examples of figures and diagrams that show optical illusion....

Do the lines straight?

Can you see the moving balls or is it static?

The impossible cube-isn't it?

How do the dices arranged?

Are you going to read the words or the colours?


A fish or a girl face?