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Sam Callander demonstrates the Zoetrope he
includes in his exhibitions about the life 
of James Clarke Maxwell.

Maxwell used his Zoetrope to demostrate his 
ideas of knot theory, using a paper inlay 
of hand drawn smoke rings passing through 
one another.

Maxwell added lenses to the viewing holes 
so that the image would appear to move in 
the centre of the drum instead of around 
the rim .