Persistence of vision
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Persistence of vision or visual persistence is the optical illusion that occurs when the visual perception of an object continues for some time after the rays of light proceeding from it have ceased t
Sparkler's trail effect
Light Painting Screw by Karsten Knöfler
Wood-cut illustration of An Optical Deception (1821)
Illustration plate for Peter Mark Roget's Explanation of an Optical Deception in the Appearance of the Spokes of a Wheel Seen through Vertical Apertures (1825)
Peter Mark Roget
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Peter Mark Roget was a British physician, natural theologian, lexicographer, and founding secretary of The Portico Library. He is best known for publishing, in 1852, the Thesaurus of English Words and
Persistence of vision
…immediately occur to your mathematical readers, but a perfect demonstration will probably prove less easy than it appears on first sight". Four years later Peter Mark Roget offered an explanation when reading at the Royal Society on December 9, 1824. He added: "It is also to be noticed that, however rapidly the wheel…
Roget c. 1865
Roget plaque, George Square, Edinburgh
Official portrait by Thomas Pettigrew