What's up with Witch Rings?

Abstract

‘Witch rings’ are well-known novelty rings that show a size-change illusion when rotated. We have replicated the illusion of expansion of the reflections in the rings in a variety of contexts with animations, though not as yet so successfully imitated the sense that the whole ring expands and contracts.

Keywords

witch ring movement and size illusion perspective cues shiny and matt surfaces Zöllner illusion

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