Modular spiral staircase system for trees
by Cory Doctorow from on (#RWAD)
If you love tree-climbing and lack upper-body strength, look no further: here's Canopystair, an ingenious system from Robert McIntyre and Thor ter Kulve, two RCA design postgrads. It uses ratchet straps and aluminum tripods to anchor the steps, and combines them with a flexible handrail. (more")