A 4-by-4 magic square is shown in this 1514 engraving
by Durer called Melancholia. A detail of the magic square is shown:
Notice the date appears in the magic square. Can
you see additional properties in addition to the usual magic square
properties?
Hint: Add the corners, or the center squares, or the slanting squares
(2, 8, 9, 15, for example).