Rabbit–duck illusion

[1] The earliest known version is an unattributed drawing from the 23 October 1892 issue of Fliegende Blätter, a German humour magazine.

It was captioned, in older German spelling, "Welche Thiere gleichen einander am meisten?"

A standard test of creativity is to list as many novel uses as one can for an everyday object (e.g., a paper clip) in a limited time.

Wittgenstein, as Shirley Le Penne commented,[5] employed the rabbit–duck illusion to distinguish perception from interpretation.

[6] Uriel Abulof said that the illusion crystallizes the interplay between freedom (choice) and facticity (forced reality).