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. 2022 Feb 7;12:817745. doi: 10.3389/fpsyg.2021.817745

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Copyright © 2022 Kim, Hong and Anstis.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Stereo disambiguation of a trapezoidal prism. When viewed in stereo, this rotating trapezoidal prism reverses its direction from time to time, like the spinning ballerina. Sometimes the large square face looks nearer as it rotates in one direction. Sometimes the smaller face looks nearer and it seems to rotate in the opposite direction. Panels (A) and (C) are identical, while panel (B) contains disparity. Please see Supplementary Video 5 for an animation.