Garter-stitch squares with cables across the diagonals. The cables appear to be continuous, because the actual start and end points of the cables are hidden under another cable at the corners of the squares. I joined the squares together as I knitted them. The ball is knitted with one continuous piece of yarn (well, two, since I used more than one skein). There is one small grafted seam at the very end, but other than that the ball is seamless, so very sturdy and stretchy and good as a toy.