20th Century Standard Puzzles [hardcover] A. Cyril Pearson
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In Albert Durer’s day, as in Milton’s, melancholy meant thoughtfulness, and on this ground, we find on his woodcut, “Melancholia, or the Genius of the Industrial Science of Mechanics,” a very early instance of a Magic Square, showing that Puzzles had a recognised place in mental gymnastics four hundred years ago.
