January 18, 2004

Magic Square

In 1514 Albrecht D?rer created an engraving called Melancholia that included a magic square. In the bottom row of his 4 X 4 magic square he placed the numbers "15" and "14" side by side to reveal the date of his engraving.


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Posted by mehrdad at January 18, 2004 06:30 PM | Science |