Gray lines appear to tilt alternately, though they are parallel.pic.twitter.com/k8WYIXMdEB
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Actually, Fraser (1908) demonstrated the Café Wall illusion. Fraser, J. (1908) A new visual illusion of direction. British Journal of Psychology, 2, 307-320.
Kitaoka, A., Pinna, B., and Brelstaff, G. (2004). Contrast polarities determine the direction of Café Wall tilts. Perception, 33, 11-20. Kitaoka, A. (2007) Tilt illusions after Oyama (1960): A review. Japanese Psychological Research, 49, 7-19.https://onlinelibrary.wiley.com/doi/10.1111/j.1468-5884.2007.00328.x …
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