J. R. Block Books

Seeing Double
Seeing Double

By J. Richard Block

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"Seeing Double is a collection of more than 200 mind-bending illustrations that trick the eye into seeing two different things - but not at the same time! Exquisitely rendered images from around th...

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Can you believe your eyes
Can you believe your eyes

By J. R. Block

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Can you believe your eyes?
Can you believe your eyes?

By J. R. Block

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Presents over 250 visual illusions gathered from around the world to explore the psychology of vision. Discusses the phenomenon of human perception and the use of illusions in society.

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Seeing Double
Seeing Double

By J. Block Richard

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Seeing Double
Seeing Double

By J. Block Richard

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If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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