Why would someone want to use sand vs something like slate, concrete, or a solid polymer?
I just visited Taleisin west of Madison, Wi, Frank Lloyd Wright home. The base is sandstone boulders, not concrete, and they are raising money to jack the foundation, for the third time since it was built. Now sandstone and sand are different, as is the requirement for stabilizing a large dwelling vs an audio component, but I do think that there is a lesson contained here.