Designers Thor te Kulve and Robert McIntyre have devised a clever system that allows anyone to build a spiral staircase up the trunk of a tree without actually hurting it and without using tools. Their innovative staircase is made of birch steps that hold on to the tree trunk with straps and grip its side with thick neoprene pads. Attaching a series of these steps, along with an accompanying handrail, creates a spiral staircase.
Designers Thor te Kulve and Robert McIntyre have devised a clever system that allows anyone to build a spiral staircase up the trunk of a tree without actually hurting it and without using tools.
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