02/02/2022
Optical illusions date all the way back to ancient Greece. The Greeks used optical illusions in their architecture and art. Its earliest applications was found in Greek rooftops. On temples, roofs were built with a slant, and observers perceived that the rooftops were curved.
An optical illusion (also called a visual illusion) is one which shows images that differ from normal reality. The information gathered by the eye is processed in the brain to give a perception. That is normal, but in these cases the appearance does not tally with a physical measurement of the stimulus source.