I tried googling but can't find specific names.
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3I'd describe these as something like "perspective illusions", although I'm not aware of a specific name. Not everything has a name.– Billy KerrCommented May 2, 2020 at 10:26
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There is a name for one specific type of such an illusion - it's called a Penrose Triangle– Billy KerrCommented May 2, 2020 at 10:48
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1Err, every object except the sphere changes with perspective.– joojaaCommented May 2, 2020 at 20:17
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@joojaa, At first I thought that was a nerdy comment, but you are absolutely right. A more precise description would be "objects that change with perspective in an unexpected way".– WolffCommented May 3, 2020 at 13:25
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2 Answers
The term ambiguous is often used about optical illusions where an object can be perceived in more than one way.
Searching for Ambiguous Illusion and Ambiguous Shape on Google yields many interesting results. For example the Ambiguous Cylinder Illusion, the Ambiguous Garage Roof and the Arrow always pointing to the right.
The site of the Best Illusion of The Year Contest has many nice examples of similar illusions.
Wikipedia has a long and interesting List of optical illusions but none of them seems to be exactly what you are asking about here.
Generally they seem to be called "Perspective Sculptures". But the term "Anamorphism" might well apply.
answered May 2, 2020 at 9:33
