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A necker cube and the equivalent showing a flat-edge crossing the other, which is impossible in 3-dimensional space, it's an optical illusion: Date: 28 December 2008: Source: Own work based on: Necker cube and impossible cube.PNG by Maksim: Author
The impossible cube or irrational cube is an impossible object invented by M.C. Escher for his print Belvedere. It is a two-dimensional figure that superficially resembles a perspective drawing of a three-dimensional cube , with its features drawn inconsistently from the way they would appear in an actual cube.
Original file (3,358 × 3,647 pixels, file size: 1.33 MB, MIME type: image/png) ... Image set Compound of five cubes (rgby and gray) Compound of five cubes
Openclipart, also called Open Clip Art Library, is an online media repository of free-content vector clip art.The project hosts over 160,000 free graphics and has billed itself as "the largest community of artists making the best free original clipart for you to use for absolutely any reason".
The Necker cube is an optical illusion that was first published as a rhomboid in 1832 by Swiss crystallographer Louis Albert Necker. [1] It is a simple wire-frame , two dimensional drawing of a cube with no visual cues as to its orientation , so it can be interpreted to have either the lower-left or the upper-right square as its front side.
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Created by me using Inkscape tracing the PNG. Licensing 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.