Circle / Square

M / T

Four / Tree


Yes / No

One of Raetz's sculptures in Geneva, seen as “oui” (“yes”) from one angle… … and “non” (“no”) from another.

Sculpture by Markus_Raetz, photos by by Fjmustak at de.wikipedia - Own work, Public Domain

There is also a Yes/No.

Video: Yes No Markus Raetz

Straight Pole + Curved Hole Illusion

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