Although the four oblique bars are parallel to each other and have the same width, two of them appear to tilt more from the vertical and to be thinner than the other two. The appearance is inverted when the stripes of the background flip over.pic.twitter.com/W8XQZIeb6E
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cf. the Wenceslas illusion Thompson, P., & Anstis, S. (2005). Retracing our footsteps: A revised theory of the footsteps illusion [Abstract]. Journal of Vision, 5(8), 929, http://www.journalofvision.org/5/8/929/ , doi:10.1167/5.8.929.
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