Drystone walls range from the 6 inch high garden border to the 22 foot high road retaining wall. Regardless of the size they are (or should be) all built the same way. Friction and gravity are the forces that hold the wall together. The drystone technique is centuries old, and is proven to last for centuries on thousands of miles of British sheep walls; up hill and down dale.
With skillful application and good use of hearting, any garden wall can be turned into an artistic monument that will still be here long after we are gone.