Optical illusions come in many different types such as
Ambiguous, impossible, contrast and color, distortion, typography,
and after effects.  “Ambiguous” illusions are the type that have more
than one picture in them.  These contain images such as the young
woman/old women.  The “impossible” illusions have no end to them
as in the impossible staircase or triangle.  The “contrast and color”
are the types that you can see more than one way such as the
Necker cube. “Distortion” is an illusion that appears as if it is
changing size or shape off in the distance. “Typography” illusions are
the type you look at it one way and it may look like a B but in the
other way it could be a 13. “After effects” are when you look at one
thing then look at something else and the image will change.
Illusions are used in many different ways. Some are half-auditory and
half-optical.  One is used by a ventriloquist so they can use their
voice with the movement of the dummy’s mouth and it tricks our brain
into thinking that the dummy is talking. The people of Ancient Greece
used optical illusions to build their temples by making the columns
bulge so that from a distance they would look the perfectly
proportioned.

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