> Alternatively, they were shaped by hand, though I'd expect them to be smoother if that were the case. Maybe they were a way of marking the passage of time in

> Alternatively, they were shaped by hand, though I'd expect them to be smoother if that were the case. Maybe they were a way of marking the passage of time in one's life? If the owners made a tiny amount of progress toward a sphere shape every day (or week/month/etc.), only the oldest folks would end up buried with one that looked like a sphere. All of the others would look more like normal rocks, and probably be ignored if they were found while digging. Two of them together, with roughly the same amount of smoothing, might mean a couple was originally buried there. The second one could also have belonged to a grieving spouse or relative, or even be a trophy taken from an enemy.