Kanizsa triangle and square are common illusory contours.
Kanizsa三角形和正方形就是常见的错觉轮廓图。
参考来源 - 错觉轮廓及缺失边界修复
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Illusory contours
abstract:Kanizsa's Triangle: These spatially separate fragments give the impression a bright white triangle, defined by a sharp illusory contour, occluding three black circles and a black-outlined triangle.
Neuroscientist Rudiger von der Heydt, of Johns Hopkins University, hasshown that illusorycontoursareprocessed in neurons within visualbrain area calledV2.