Fraser spiral illusion
Fraser spiral illusion's theme is one that has captured the attention and curiosity of many people over the years. It is a topic that has generated debate, discussion and reflection in various spheres of society. From the academic field to the popular field, Fraser spiral illusion has been the object of study, analysis and exploration. As society advances and evolves, the interest and relevance of Fraser spiral illusion continues to constantly change, expanding into new areas and raising new questions. In this article, we will thoroughly explore the importance and impact of Fraser spiral illusion in different contexts, as well as its influence on our daily lives.
The Fraser spiral illusion is an optical illusion that was first described by the British psychologist Sir James Fraser (1863–1936) in 1908.[1]
The illusion is also known as the false spiral, or by its original name, the twisted cord illusion. 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] The Zöllner illusion and the café wall illusion are based on a similar principle, like many other visual effects, in which a sequence of tilted elements causes the eye to perceive phantom twists and deviations.
The illusion is augmented by the spiral components in the checkered background. It is a unique illusion, where the observer can verify the concentric strands manually.[3] When the strands are highlighted in a different colour, it becomes obvious to the observer that no spiral is present.[4]
See also
References
- ^ Fraser, James (January 1908). "A New Visual Illusion of Direction". British Journal of Psychology. 2 (3): 307–320. doi:10.1111/j.2044-8295.1908.tb00182.x. ISSN 0950-5652.
- ^ Cucker, Felipe (2013). Manifold Mirrors: The Crossing Paths of the Arts and Mathematics. Cambridge University Press. pp. 163–166. ISBN 978-0-521-72876-8.
- ^ Stern, Tom (October 1, 2013). Philosophy and Theatre: An Introduction. Routledge. p. 57. ISBN 9781134575985.
- ^ See Bach, Michael. "Fraser Illusion". Visual Phenomena & Optical Illusions. Archived from the original on 2011-11-02. Retrieved 2005-06-11.
External links
- Fraser's Spiral from MathWorld
- Bach, Michael. "Fraser Illusion". Visual Phenomena & Optical Illusions. Archived from the original on 2011-11-02. Retrieved 2005-06-11. An interactive Fraser Spiral
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