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#optical illusion #visual distortion #perception trick #dizzying pattern #impossible shape #visual confusion

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#penrose triangle #tribar #impossible object #optical illusion #impossible shape

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#spatial dimension #fourth dimension #tesseract #hypercube #non-Euclidean #mind bending #impossible shape

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#circle sides #geometric paradox #impossible shape #round square #mathematical riddle #questioning geometry #thine sides concept