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From Nordan Symposia
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File:Ascending and Descending.jpg The [[original]] [[print]] measures 14" x 11 1/4”. The lithograph depicts a large building roofed by a never-ending stai ...n impossible object; Lionel Penrose had first published his concept in the February, 1958 issue of the ''British Journal of Psychology''. Escher developed the(300 × 398 (26 KB)) - 15:08, 24 August 2010
