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This image of simple geometry is ineligible for copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship. Heptagon
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The following other wikis use this file: Usage on ar.wikipedia.org ويكيبيديا:أيقونات/3; Usage on ca.wikipedia.org Viquiprojecte:Monuments/Repte 2016
fill circle and then put cross symbol: 23:42, 23 April 2015: 512 × 195 (507 bytes) Krishnavedala: much reduced: 18:02, 5 February 2014: 110 × 42 (660 bytes) Krishnavedala: Hand drawn, smaller size, smoother rendering, added info in the header. 22:31, 2 June 2007: 110 × 40 (6 KB) Bdesham: making the insides of the circles white instead of ...
An autostereogram is a single-image stereogram (SIS), designed to create the visual illusion of a three-dimensional (3D) scene from a two-dimensional image in the human brain. An ASCII stereogram is an image that is formed using characters on a keyboard. Magic Eye is an autostereogram book series. Barberpole illusion
Viewing the inside of the sphere from the outside, through its transparent surface, produces serious distortions. Opaque celestial globes that are made with the constellations correctly placed, so they appear as mirror images when directly viewed from outside the globe, are often viewed in a mirror, so the constellations have their familiar ...
In differential topology, sphere eversion is the process of turning a sphere inside out in a three-dimensional space (the word eversion means "turning inside out"). It is possible to smoothly and continuously turn a sphere inside out in this way (allowing self-intersections of the sphere's surface) without cutting or tearing it or creating any ...