Stone sitting walls average about 18 inches in elevation off the ground, and many of them double as stone retaining walls. Only one of the ones pictured here is freestanding – no soil behind it.
Some of these are curved, and some are straight. The curved sitting walls I build draw inspiration from the in-ground kivas built by Native Americans in the southwestern US. Most of the ones I build have alignment with cardinal directions, and several of them have more complex markings such as solstice, equinox, and lunar standstills.
Single slabs work best as the top surface of a sitting wall. They last longer than smaller stones placed or mortared together.