This is the lasted trend on how Stonehenge and Easter Island statues were constructed. A rounded bottom helps with center of gravity and movability. The Easter Island statues have a rounded bottom so, like Weebles, they can be moved easily by wobbling them along. Same with the Stonehenge pillars. Standing the pillars upright, it’s thought they were in part wobbled upright.
When re-erecting what was left of a megalithic structure in England, the crushed remains of an Englishman of hundreds of years ago was found. Apparently the death occurred during activities that treated the site like a quarry. :^) Dating the remains was accomplished by coins in his purse.