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