Zoellner illusion. The vertical lines are parallel but seem to be tilted. There are 2 theories as to why this is the case. The first is that the small

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Zoellner illusion. The vertical lines are parallel but seem to be tilted. There are 2 theories as to why this is the case. The first is that the small crossing lines create a perception of depth and our brain's interpretation of perspective leads to the illusion. The second is that the effect is a result of our visual system's propensity to try to minimise acute angles - applied to the small crossing lines.

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Photo credit: © Science Photo Library / Alamy / Afripics
License: Licensed
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Keywords: acute, angle, illusion, illusory, neuroscience, optical, parallel, perspective, psychology, trick, vision, visual, zoellner, zollner