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Shepard tables illusion, named for its creator Roger N. Shepard. Shepard tables (also known as the Shepard tabletop illusion) are an optical illusion first published in 1990 as "Turning the Tables," by Stanford psychologist Roger N. Shepard in his book Mind Sights, a collection of illusions that he had created. [1]
These patterns and shapes can be seen without aid of psychotropic substances but under their influence the heightened effects precipitate modes of altered consciousness. Entoptic experiences differ from hallucinations in that they are a purely visual phenomenon, while hallucinations represent experience of culturally occurring themes as well as ...
Haidinger's brush is a very subtle bowtie or hourglass shaped pattern that is seen when viewing a field with a component of blue light that is plane or circularly polarized. It's easier to see if the polarisation is rotating with respect to the observer's eye, although some observers can see it in the natural polarisation of sky light. [1]
Curvilinear barrel distortion Curvilinear pincushion distortion. Curvilinear perspective, also five-point perspective, is a graphical projection used to draw 3D objects on 2D surfaces, for which (straight) lines on the 3D object are projected to curves on the 2D surface that are typically not straight (hence the qualifier "curvilinear" [citation needed]).
Glass chart. A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.
Eye pattern of a 1.25 Gbit/s NRZ signal through a lossy channel As high frequency losses increase the overall shape of the eye gradually degrades into a sinusoid (once higher frequency harmonics of the data has been eliminated, all that remains is the fundamental) and decreases in amplitude.
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a pattern using only part of the dot grid. If that is the case, the same pattern or a different pattern fills/uses up the remaining dot grids. Most of the times, these patterns together end up becoming a complex pattern. [citation needed] a pattern in which a stroke runs around each dot incompletely, but open.