411 REFERENCE · Wiktionary
Rubin vase
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
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Etymology
Developed by Edgar Rubin.
Noun
An optical illusion that may be seen either as the profiles of two people facing each other, or as a vase (formed by the space between them).
en eponyms
en Optical illusions