Figures {ambiguous figure}| can have two ways that non-vertical and non-horizontal lines can orient or have two ways to choose background and foreground regions. In constant light, observed ambiguous-figure surface-brightness changes as perception oscillates between figures [Gregory, 1966] [Gregory, 1986] [Gregory, 1987] [Gregory, 1990] [Gregory, 1997] [Seckel, 2000] [Seckel, 2002].
Figures (Jastrow) with duck beaks and rabbit ears make illusions {duck-rabbit illusion}.
Vases with profiles of symmetrical faces (Edgar Rubin) can make illusions {vase and two faces illusion} {Rubin vase}.
Old crone with black hair facing young girl can make illusions {Salem witch and girl illusion}.
1-Consciousness-Sense-Vision-Illusions
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Date Modified: 2022.0225