ambiguous figure
Ames room
anamorphosis
antigravity houses and hills

Benham's disk

distortion illusion

eidetic image

Fraser spiral
Freemish crate

Get Off the Earth

hallucination
Hermann grid illusion
Herring illusion

illusion
impossible figure
impossible motion
impossible tribar
impossible trident
irradiation illusion

lateral inhibition illusion

mirage
Moiré pattern
Müller-Lyer illusion

Necker cube

optical illusion
Orbison's illusion

Penrose stairway
Penrose triangle
Poggendorff illusion

Schröder's reversible staircase
scintillating grid illusion

Thiery figure
Titchener illusion
tribar illusion

upside-down picture

vertical-horizontal illusion

Wundt illusion

Zöllner illusion