What do the backgrounds whisper to us?You have a message intwoparts:part 60's psychedelic, part OpticalArt.
这些背景在跟我们耳语些什么?您得到的答案包含两个部分：60年代的迷幻，和光学艺术。
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Visitors look round a Bridget Riley exhibition in Paris. The British artist is famous for her so-called Op-art paintings, which make use of optical illusions.
Vision scientist Lothar Spillmann at the University of Freiburg in Germany stumbled upon the illusion while browsing Ouchi's book on Japanese Optical and Geometrical Art.