What's up with Witch Rings?. (January 2015)

• Record Type: Journal Article
• Authors: Heard, Priscilla; Phillips, David
• Is Part Of: Perception. Volume 44:Number 1(2015)
• Page Start: 103
• Page End: 106
• Publication Date: 2015-01
• Subjects: witch ring -- movement and size illusion -- perspective cues -- shiny and matt surfaces -- Zöllner illusion; Perception -- Periodicals; Perception -- Periodicals; Perception; Periodicals; 153.705
• DOI: 10.1068/p7865
• Languages: English
• ISSNs: 0301-0066

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.