"gripping and hugely entertaining... difficult to put down."
- New Scientist

Perception or Reality (continued)

by Gruff Davies

10. Shepherd tones
You'll need earphones or speakers for this unsettling aural illusion.

You've probably seen Escher's famous Ascending and Descending woodcut in which monks climb and descend an impossible perpetual staircase. Cognitive Scientist Roger Shepherd realised that it would be possible to construct an equivalent aural illusion with tones that appear to continually rise or descend.

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