You're really talking utter balls recently aren't you.
sure am, and proud of it too :-) plus I've been enjoying drawing balls in all sorts of funny positions - bouncing around here and there, going in holes and skirting round hole rims, and even getting stuck on point bits (arg).Oddball: I'm just going to think about that.
markcw: might seem logical but I don't think it's realistic. Wonder what would happen with a marble dropped on the edge of a steel triangle. Bet it wouldn't bounce back up. It would go left or right depending on where it hit first because it would've always been a fraction of a mm to one side or the other the point.