Bird in the cage illusion

Bird in the cage illusion

This time i have for you illusions of bird in a cage. Mechanism works by manual drive, you have to twist the crank by hand.

Similar to previous project the base of mechanism is alarm clock case. Movement from crank is transmitted by belt to the pulley above.

This toy isn’t something new, the invention named¬†thaumatrope is usually credited to British physician John Ayrton Paris. He maked it to demonstrate persistence of vision to the Royal College of Physicians in London in 1824.

In both side of the disc are different images. When the disc are twirled quickly, the two pictures appear to blend into one.  The classic thaumatrope uses a twisted strings to rotate a disc. My version uses a manual crank to transmit rotational movement into the disc.

Thaumatrope was popular in the 19th century. The first commercial thaumatrope was registered at Stationers’ Hall on April 2, 1825 and published by W. Phillips in London as The Thaumatrope; being Rounds of Amusement or How to Please and Surprise By Turns, sold in boxes of 12 or 18 discs.

Thanks for watching!

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