A Unique Stone Pile

Where a stone wall might normally be located,  along a gravel road, there was  instead, a series of "stand alone" rock piles, spaced in a line, about 10 feet apart. My first thought was that the wall builder had planned to go back and fill in the spaces between each of the piles, but upon a closer look, each pile was unique and complete in itself.   The one shown here is especially interesting. The flat stone on the left must have been carried from a rock outcrop located about 1/4 of a mile to the east. Small white stones are SET  under the flat stone, and a large loaf like stone is PLACED  on top,  providing  visual balance to the remainder of the construction.  The round rocks climbing up the "back" on the right are not fitted together, but arranged so that they touch one another on  as small a surface as possible, yet remain stable.