Photograph of a waterfall
Falling Water, Rising Rocks, 1834
Intrigued by an optical illusion he experienced while traveling in Scotland, Robert Addams wrote what is now considered one of the definitive observational accounts of so-called motion aftereffects.
ABOVE: © SANDY GERRARD
Falling Water, Rising Rocks, 1834
Falling Water, Rising Rocks, 1834

Intrigued by an optical illusion he experienced while traveling in Scotland, Robert Addams wrote what is now considered one of the definitive observational accounts of so-called motion aftereffects.

Intrigued by an optical illusion he experienced while traveling in Scotland, Robert Addams wrote what is now considered one of the definitive observational accounts of so-called motion aftereffects.

ABOVE: © SANDY GERRARD
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optical illusion

Are You Smarter Than Your Dog?
The Scientist Staff | Jan 11, 2021
Check out the optical illusion that researchers put before canines, finding that fido and master have opposite reactions.
A Dog’s View of Optical Illusions
Catherine Offord | Jan 1, 2021
Researchers are using visual tricks to try to better understand canine perception.