“Exorcist Illusion”: Twisting Necks in the Hollow-Face and Hollow-Torso Illusions by Thomas V. Papathomas, Marcel De Heer, Xiaohua Zhuang, Tom Grace, Robert Bunkin

“…The two simplest effects are (1) when the object is rotated about its axis, the head appears to twist with respect to the torso, as in “The Exorcist” film (2) when it is rotated around an axis parallel to the shoulders, the head appears to hinge around the torso. …”
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