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Note the thumbnail below is a degraded version of the actual image which is much sharper. A Necker cube is basically a wireframe drawing of a six-sided cube such that it has no perspective as to whether you're looking at it from the top or from the bottom. This is an example of two exactly identical necker cubes, the one on the left showing an intermediate object going in "down from the top" while the one on the right shows the object going in "up from the bottom" which shows how the image can change its perspective simply by changing which face (front or back) appears behind the intervening object. cube necker cube optical illusion 2 Necker Cubes
An example of a necker cube and an Impossible cube (one arm runs across the other but is still straight, which can't happen in 3D; it's an optical illusion). cube necker cube optical illusion Necker cube and impossible cube
Illusion discovered in 1860 by physicist JC Poggendorff. Шеляга, В.В., Глоточкина, А.Д., Платонова, К.К. (1972). Военная психология. Москва. lin optical illusion human perception Optical Illusion (2)
Simple op art textures done in a pale color perfect for placing something on top of. Made in Illustrator CS3. op art number 62 green NixVex Free Vector of Op Art Background in Green
Jegorow, F.G. (1957). Militaerpsychologie. Berlin: Verlag des Ministeriums fuer nationale Verteidigung. optical illusion human perception pol Optical Illusion (3)
SOURCE: Шеляга, В.В., Глоточкина, А.Д., Платонова, К.К. (1972). Военная психология. Москва. optical illusion human perception lin Optical Illusion (5)
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