The owners used to camp on the property. Their camp was a tarp suspended from four trees. Underneath the tarp they would make a fire pit - to stay warm.
The design for their vacation house is four tree trunks used as posts. The posts extend above the roof to support a tarp. This puts their camp on the roof of their house - up in the trees.
I have suggested that we build a fire pit on the roof - under the tarp to recall the days when they camped.
For some strange reason they are skeptical about starting a fire on the roof...