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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts
This image is an animated SVG file. The .png preview above created by RSVG for use in Wikimedia is not animated and may be incomplete or incorrect. To see the animation, open media:Rolling circle optical illusion.svg. It should run in any modern browser or viewer.
Optical illusion: All edges in the image are straight and either horizontal, vertical, or at a 45° angle, but may appear otherwise... Date: 2012: Source: SVG file created by me from scratch in a text editor, declared to be PD. Author: AnonMoos: Permission (Reusing this file)
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
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Original file (SVG file, nominally 1,011 × 769 pixels, file size: 16 KB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
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The "Blivet" or "Poiuyt" impossible object shown against a warped checkerboard optical illusion background. There are no curved lines in the picture, except the ovals at the ends of the tines of the fork. The sides of the squares of the green-and-white checkerboard are strictly horizontal or vertical. Date: 2012: Source: Own work using: