click pix to enlargeAll the numbers in the rows and columns add up to 34. So do the diagonals. So also do the four inside squares, AND the four outside squares. 34 is a Fibonnacci number. ...1, 2, 3, 5, 8, 13, 21, 34... Cool huh? Now what? Oh yeah, the drawing was done in 1514 by Albrecht Dürer. See bottom row. Wild.