Designers Thor ter Kulve and Robert McIntyre revealed a spiral staircase that can be installed on a tree trunk without using any tools or harming it. This innovative staircase is made out of birch steps that hold on to the tree trunk with straps. It is set up by attaching a series steps along with an accompanying handrail. Kulve and McIntyre came up with the idea for the CanopyStair while spending time on an island in the Portuguese Azores archipelago. The house they stayed at was surrounded by a high wall blocking the property’s sea views so they had to climb up a tree to get a better view.
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