An illusion is surely a strange perception.
A list of well known illusion types follow:
Ψ Impossible figure
Ψ Natural occurring, i.e. the moon illusion
Ψ Ames room
Ψ Müller-Lyer illusion
Ψ Ponzo illusion (below)
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We can learn about perceptions & how to manipulate them from the study of illusions.
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