It's a pity these are not big stones, rather than concrete. Big stones love to be moved, just as much as the small ones. Big stones love to be shaped too. Sometimes they have to be shaped into spheres in order to get them where they need to be. When they get there, they can be shaped again into big cubes or large steps or huge standing stones like the Ring of Brodgar in Scotland. How else could they have got them there?
.