Optical illusion or visually perceived images that differ
from objective reality. The information gathered by the eye is processed in the
brain to give a perception 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, colour, size, position, tilt, movement), and cognitive
illusions, the result of unconscious inferences.
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