The first modern Thaumatrope was made by Dr John Ayrton Paris in 1825.
A Thaumatrope is essentially a disc of card with a picture on each side, and string attached to both sides of the disc.
Commonly, the pictures are of a bird on one side, and a cage on the other. Although these pictures can actually be anything.
The Thaumatrope works by twisting the strings on either side of the disc, creating tension. When this tension is released, this causes the disc to spin so fast that it gives the illusion of the two pictures appearing together at once.
Therefore on this example, the bird appears to be in the cage.
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