In fact, our design writer Kim has shown a lot of hanging tents, like this one from the logically named Hanging Tent Company. It started as a thesis in design school as the Roomoon.
The Roomoon's strong and durable stainless steel frame is held rigid with push pins, and can collapse into an car-sized package for easy transport to wherever you need to camp. The handmade canvas cover protects the inhabitants, but has zippered openings that allow the Roomoon to become a cozy vantage point to watch the landscape.
More in TreeHugger: Spherical Roomoon is a haven that hangs among the trees