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Big Book of Optical Illusions
Big Book of Optical Illusions, ISBN 0764135201
New Optical Illusions
New Optical Illusions, ISBN 1844423271
Fantastic Optical Illusions
Fantastic Optical Illusions, ISBN 1844423271
Dazzling Optical Illusions
Dazzling Optical Illusions, ISBN 0806983930


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Shadow Illusions


by Gianni A. Sarcone and Marie-Jo Waeber


"Tutte le ombre parlano del sole,
sottovoce "
Emanuel Carnevali

Cast shadow influence on depth perception
A ball in motion - sliding diagonally across a table top - appears rolling, rising in the air, or bouncing, depending on the relative position of its shadow (although the original path of the ball remains unchanged!)

Original animation

Rolling marble

Floating bubble

Bouncing rubber ball

Strange triacontadohedrons
The green cylinder is placed on top or inside the polyhedron?
(see also kickboxer illusion)


Discovering the Shadow

"La scoperta dell'ombra" written by Roberto Casati
is an excellent book about shadows
... We recommend it!




© 1992-2010 G. Sarcone,
You can re-use content from Archimedes’ Lab on the ONLY condition that you provide credit to the authors (© G. Sarcone and/or M.-J. Waeber) and a link back to our site. You CANNOT reproduce the content of this page for commercial purposes.

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