following user names refer to en.wikipedia. Drawing of the Necker cube and impossible cube. Both on one image since: they are related they are often confused...
Necker cube, taken from en.wiki Taken from en:Image:Necker_cube_and_impossible_cube.PNG, cropped, and uploaded. History of the original file on en.wikipedia:...
History of the original file on en.wikipedia: 16:24, 7 October 2002 . . Tarquin (2749 bytes) (Drawing of the Necker cube and impossible cube) English...
This image is a derivative work of the following images: Necker cube and impossible cube.svg licensed with Cc-by-sa-3.0, GFDL, LGPL 2010-05-08T13:30:29Z...
Alike 3.0 Unported license. You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions:...
This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or...
c.png Deutsch: Die Unmögliche Lattenkiste (Ansicht 3) ist eine optische Illusion. English: The impossible crate (view 3), also known as Necker cube, is...
