Mozilla Firefox. Giuseppe Arcimboldo - The complete works. Optical Illusions. Optical illusion are 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 two main types of illusion - 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.