Optical illusions

thumb|A drawing of a Kaiserpanorama with 25 viewing stations. The Kaiserpanorama (or Kaiser-Panorama) is a form of stereoscopic entertainment medium used chiefly in the 19th and early 20th centuries, and is considered a precursor to film. It was invented by August Fuhrmann (1844–1925), and patented by him in 1890. It consisted of a number of viewing stations from which people would peer through a pair of lenses to view a number of rotating stereoscopic glass slides. By 1910 Fuhrmann is said to have controlled exhibitions in over 250 branches across Europe, and to have held up to 100,000 slides

metallic mirrors of ancient China

type oder illusion

A device used to test the resolution of optical instruments, printers or displays.

how humans perceive color

Micropsia is a condition affecting human visual perception in which objects are perceived to be smaller than they actually are. Micropsia can be caused by optical factors (such as wearing glasses), by distortion of images in the eye (such as optically, via swelling of the cornea or from changes in the shape of the retina such as from retinal edema, macular degeneration, or central serous retinopathy), by changes in the brain (such as from traumatic brain injury, epilepsy, migraines, or drugs), and from psychological factors. Dissociative phenomena are linked with micropsia, which may be the re

optical illusion

optical illusion

optical illusion

traditional motif showing three hares sharing ears

visual illusion that evokes the perception of an edge without a luminance or color change across that edge

optical illusion

Human visual perception phenomenon

perception or recognition of faces in something essentially different

Roadside attraction in Gold Hill, Oregon, US

optical illusion

An anorthoscope is a device that demonstrates an optical illusion that turns an anamorphic picture on a disc into a normal image by rotating it behind a counter-rotating disk with four radial slits. It was invented in 1829 by Belgian physicist Joseph Plateau, whose further studies of the principle led him to the 1832 invention of a stroboscopic animation that would become known as the phénakisticope (commonly regarded as a pinnacle in the development of cinematography, and thus as an important step in the history of modern media).

optical illusion

visual illusion seen in a pair of identical images of the Leaning Tower of Pisa

optical illusion

optical illusion

humans' ability to separate foreground from background in visual images

trapezoid that appears as rectangular

optical illusion

perception of 3D scene from a sideways moving image

image that is perceived in one of two different ways, depending on viewing distance

optical illusion

optical illusion

2000 film by Gert de Graaff

illusion of color seen when looking at certain rapidly changing or moving black-and-white patterns

phenomenon in numerical cognition

optical illusion

thumb|Modern horsemaning thumb|A modern example of horsemaning

optical illusion

optical illusion

thumb|Blue–red contrast demonstrating depth perception effects thumb|3 Layers of depths "Rivers, Valleys & Mountains" Chromostereopsis is a visual illusion whereby the impression of depth is conveyed in two-dimensional color images, usually of red–blue or red–green colors, but can also be perceived with red–grey or blue–grey images. Such illusions have been reported for over a century and have generally been attributed to some form of chromatic aberration.

optical illusion

perceptual phenomenon

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