A collection of hundreds of thought-provoking optical illusions.

Hungry minds will be stimulated by clever and thought-provoking optical illusions contained in this compact size book to fit easily in the hands of young readers eager to be stumped. Illustrations.

Selection of over 280 optical illusions from historical and modern sources.

Presents optical illusions and explains why the eyes perceive what isn't actually so.

Contains a collection of over 200 unusual illusions including hidden objects, color and brightness effects, illusory moving patterns, and image paradoxes.

In The Mighty Big Book of Knock-Knock Jokes, you'll find over 700 silly knock-knock jokes, "door jams," and related puns, completely illustrated with some of the wackiest line drawings ever. This new joke book is guaranteed to have budding comedians laughing (and knocking) for hours!

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