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Time Problem edit
How can he have invented this optical illusion in 1889 when it has been mentioned already in the book published by 1868? Kassner (talk) 09:27, 8 January 2016 (UTC)
Definition edit
This article has a lot to say about the illusion and different variants thereof, but doesn't actually define it anywhere. Dfeuer (talk) 20:39, 27 October 2021 (UTC)