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Comments to #5
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ptpie 13 year s ago
liked
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Tarzan 13 year s ago
naice...
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GOODSTUFF4U 13 year s ago
great set - #7 is worth the effort units to comment
The impossible triangle
A photo of a model made by English geneticist Lionel Primrose, part of a 1950s series of figures that not only laid the foundation for the study of illusions but also inspired some work by artist MC Escher.