Concentric Circles Illusion - Mental Bomb
The Fraser spiral illusion involves a pattern of concentric circles that appear to spiral outwards from the center, even though the circles are actually arranged in perfectly straight lines. The illusion is created by the positioning of alternating black and white segments along the circumference of each circle, which creates a visual ...
Fraser spiral illusion - Wikipedia
The overlapping black arc segments appear to form a spiral; however, the arcs are a series of concentric circles. The visual distortion is produced by combining a regular line pattern (the circles) with misaligned parts (the differently colored strands). [2]
List of optical illusions - Wikipedia
The Ehrenstein illusion is an optical illusion studied by the German psychologist Walter Ehrenstein in which the sides of a square placed inside a pattern of concentric circles take an apparent curved shape.
Fraser's Spiral -- from Wolfram MathWorld
3 days ago · The illusion is also known as the false spiral, or by its original name, the twisted cord illusion. While the image appears to be a spiral formed by a rope containing twisted strands of two different colors, it actually consists of concentric circles of twisted cords.
Spiral illusion - 立命館大学
Sep 25, 2004 · Concentric red lines appear to be spirals. In addition, the left "eye" appears to rotate counterclockwise while the right one clockwise. Furthermore, both "eyes" appear to expand.
Fraser’s illusion is made up of concentric circles that appear to be spirals. However, although the illusion can fool the human visual system, it can’t fool a camera. The camera records the concentric circles, which can be confirmed by tracing the circles in the image with a finger.
Concentric Spirals - Optical Illusion & Explaination
Concentric circles with a little twist, or is this a large spiral? What: This optical illusion is an alternate example of the “Fraser spiral” or “concentric spiral” illusion. Named by British psychologist James Fraser in 1908 [1], and while it doesn’t have rounded “loops”, the visual noise creates similar lines, causing the same ...
Fraser spiral illusion - New World Encyclopedia
In this illusion, overlapping black arc segments appear to form a spiral; in reality, the arcs are a series of concentric circles. Although the Fraser spiral illusion and other similar illusions have not been completely explained, they has stimulated much …
Delboeuf Illusion -- from Wolfram MathWorld
An illusion due to Franz Joseph Delboeuf, a Belgian philosopher and expert on hypnosis. If the same circle is placed inside two different concentric circles, its size will apparently vary.
Straight Lines That Curve, Circles That Twist and Other Mind …
Aug 1, 2016 · Vision scientist and illusion creator Akiyoshi Kitaoka of Ritsumeikan University in Japan has further demonstrated this effect in minimalist fashion by isolating it to a single row of mortar with...