Talk:Jastrow illusion

Time Problem
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
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)