Are you really sure that a floor can’t also be a ceiling? - M. C. Escher M. C. 에셔Escher라는 그래픽 아티...
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There is a theory which states that if ever anyone discovers exactly what the Universe is for and why it is here...
Upward, not Northward. - Edwin A. Abbott, <Flatland: A Romance of Many Dimensions> 플랫랜드Flatlan...