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关键词： 递归
Infinite Spring - POV-Ray
Tree of Squares - POV-Ray
Sponges - POV-Ray
Tree of Squares [版本 2/4] - Povray
Tree of Squares [版本 1/4] - Povray
Tree of Squares [版本 3/4] - Povray
Infinite Spring [版本 1/2] - Povray