>>7058579The ball won't roll because balls roll in order to get to the lowest point, which is the center of the Earth. But it's usually blocked by something, like the ground. If it's on a perfectly round sphere, then there's no reason for it to roll, because it's already at it's lowest possible point, with the ground blocking it from going any further.
Otherwise you could never stack pool balls because they'd always try to roll off each other.
