不可能的图形
参考文献
- aomicom. . www.yi2.net. 奥秘世界. [2017-07-02].
- Dejan Todorović. (htm). 2005 Third prize. illusionoftheyear.com. Impossible figure | Best Illusion of the Year Contest. University of Belgrade, Serbia: Best Illusion of the Year Contest: 1. 2005 [2017-07-02] (英语).
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