Gray lines appear to tilt alternately, though they are parallel.pic.twitter.com/k8WYIXMdEB
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Münsterberg, H. (1897) Die vershobene Schachbrettfigur. Zeitschrift für Psychologie, 15, 184-188. Gregory, R. L. and Heard, P. (1979) Border locking and the Café Wall illusion. Perception, 8, 365-380.
Actually, Fraser (1908) demonstrated the Café Wall illusion. Fraser, J. (1908) A new visual illusion of direction. British Journal of Psychology, 2, 307-320.
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