Barnaby has got square balls

It's some years since I last tried juggling and I have got somewhat rusty,  but I was given a new set of juggling balls at Xmas so it's time to flex those old biceps (or is it triceps?) again and get practising.  Fortunately the new balls are more cuboid than spherical, so they don't roll far when I drop them. So far no one has been impressed by my erratic throwing.  Not even me.