A thaumatrope is an optical illusion toy that was popular in the 19th century. It was invented in 1826 by a British doctor, John Ayrton Paris. This toy comprises of a small disc with a different image on each side - the images are related (e.g. a bird on one side, and a bird cage on the other). The disc is attached to 2 strings. When the strings are twirled quickly between the fingers the 2 pictures appear to merge or blend into one due to the Persistence of Vision.
Peristence of Vision is the eye's ability to keep seeing an image of an object for a fraction of a second after the object has disappeared from view. Persistence of Vision allows us to see motion pictures and animated cartoons.
Thaumatrope comes from the Greek words:
Thauma, meaning 'wonder' and,
Tropos, meaning 'turn'.
So, thaumatrope means 'wonder turn'.
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