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View search results from all Wolfram sites (5230 matches)An illusion studied by the psychologist Walter Ehrenstein in which the sides of a square placed inside a pattern of concentric circles take an apparent curved shape. The name ...
An illusion in which the eye alternately sees two black faces, or a white goblet.
An illusion named after the psychologist Joseph Jastrow. In the above figure, the left edges of the laminas A and B are colinear, creating an illusion of different size. ...
An optical illusion in which the orientation of arrowheads makes one line segment look longer than another. In the above figure, the line segments on the left and right are ...
An illusion invented by the German psychologist Wilhelm Wundt in the 19th century. In the figure above, the two red horizontal lines are both straight, but they look as if ...
A circle with an arrow indicating a direction.
Not concentric.
The radius of the smallest circle centered at one of the points of an N-cluster, which contains all the points in the N-cluster.
The number of inward directed graph edges from a given graph vertex in a directed graph.
In combinatorial mathematics, the series-parallel networks problem asks for the number of networks that can be formed using a given number of edges. The edges can be ...
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