Source: http://www.coloribus.com/paedia/ prints/2000/09/27/193500/ Year: 2000

Source: http://www.coloribus.com/paedia/prints/ 2000/09/27/193499/ Year: 2000

An optical illusion (also called a visual illusion) is characterized by visually perceived images that are deceptive or misleading. The information gathered by the eye is processed by the brain to give a percept that does not tally with a physical measurement of the stimulus source. There are three main types of illusion - literal optical illusions that create images that are different from the objects that make them, physiological illusions 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. - Wikipedia.

A cliché (from French, klɪ’ʃe) is a phrase, expression, or idea that has been overused to the point of losing its intended force or novelty, especially when at some time it was considered distinctively forceful or novel. – Wikipedia.