#optical illusions

This one always gets me at first glance.

source: Geneva, Bibliothèque de Genève, Ms. lat. 49, ff. 10r, 11r, and 13r

Close. The thing you assumed was a birch tree is actually a duck. There is, surprisingly, no cat in that picture.

Linda Besemer — Spatial Bulge #2 (acrylic on panel, 2005)

'phenakistoscope,' optical illusion designed by joseph antoine ferdinand plateau, 1832.

~ Red | White | Turquoise ~

And then some illusions work the same for all species. And there’s a subgroup of neurologists/xenobiologists that are obsessed with them because they are indications of specific errors consistent across all advanced brains. Which probably has Implications

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