CanopyStair is a spiral staircase that straps around any tree trunk


Graduate shows 2015: a pair of Royal College of Art graduates have created a new way to climb trees – strapping steps around the trunk to form a spiral staircase up to out-of-reach branches.

CanopyStair by Thor ter Kulve and Rob McIntyre

Thor ter Kulve and Robert McIntyre's CanopyStair comprises modular wooden platforms made from curved birch plywood, typically used to build small aircraft.

When bound to a tree trunk with adjustable woven ratchet straps at staggered heights and orientations, the modules can be used as steps.

CanopyStair by Thor ter Kulve and Rob McIntyre

"Since tree trunks are all unique we had to design a system that would adapt to their uneven surfaces, whilst not harming the tree in any way," Ter Kulve told Dezeen.

One end of the step has a triangular profile, where thick neoprene pads mounted on sand-cast aluminium joints at each corner create three soft contact points with the tree.

CanopyStair by Thor ter Kulve and Rob McIntyre

"We have worked with the arboriculturalists at Hampstead Heath to ensure we are not damaging the tree," said McIntyre.

The curved shapes of the steps were designed to help the elements to appear straight even if they are slightly uneven when installed as a spiral set.

CanopyStair by Thor ter Kulve and Rob McIntyre

Ash poles attached to the end of each step can be strung together with lengths of flexible plastic to create a balustrade. Each tread also has a coarse top surface for better grip.

"As one climbs the steps, the slight curve on the top surface of the tread acts to 'cradle' your foot, adding to the sense of security," Ter Kulve said.

CanopyStair by Thor ter Kulve and Rob McIntyre

Kulve and McIntyre, who both studied on the RCA's Design Products course, came up with the idea for the CanopyStair while spending time on an island in the Portuguese Azores archipelago last year.

The house they stayed at was surrounded by a high wall, blocking the property's sea views, so the pair shimmied up a tree to get a better vantage point.

CanopyStair by Thor ter Kulve and Rob McIntyre

"Only by climbing a tree in the garden could we watch the sun setting across the ocean," McIntyre told Dezeen. "We began to discuss ways of transforming a garden tree into a staircase, allowing us to walk up and down easily and enjoy the view."

To alleviate safety issues with installing the higher treads, the designers suggest using simple rock-climbing equipment to secure whoever might be at risk of falling.

CanopyStair by Thor ter Kulve and Rob McIntyre

Installation times vary depending on the desired height on the staircase. "To set up a seven-metre-high staircase would take about three hours with two people," Ter Kulve said. "Taking that down would take about 30 minutes."

The duo hopes that providing an easy route up trees will encourage the exploration of their upper reaches.

"The canopies of trees are the least explored ecosystem on the planet – we know less about them than we do the deep ocean," said McIntyre. "On climbing the CanopyStair, one enters this secret world, and it is somehow mesmerising."

CanopyStair by Thor ter Kulve and Rob McIntyre

A prototype CanopyStair, created with the support of London architecture studio Haworth Tompkins, was successfully erected and used in Sussex. It has now been installed outside the RCA's Kensington campus as part of this year's graduate exhibition.

Show RCA 2015, which runs from 25 June to 5 July, also features "power glove" that carves objects with its fingertips.

Photography is by Tony McIntyre.

  • Simon Gerssen

    Did this tree ask for it?

    • schtumm

      Trees are usually not very talkative.

    • rem

      Funny one would feel bad for the tree that carries it, not for the one that was chopped down to carve the steps. I think neither cares.

  • SFD

    Such a simple yet effective design. Great inspiration.

  • guisforyou

    This will kill the trees! Humans are dressed ugly enough… please stop visually contaminating nature as well. Plus, if you can’t climb the tree as a child does, you shouldn’t be up there.

    • Fred

      What about children who are handicapped? Do they not deserve to get the feeling of having climbed a tree? Or an old man who wants to feel like a child again?

      • Stefan

        No, some things aren’t meant to be. Like stairs on a tree, or a handicapped person climbing one.

      • jonathan

        I think if you are handicapped you aren’t climbing trees with or without stairs so…

  • peter

    Did the designers calculate the pressure on the cambium layer and talk to a biologist to see if it would harm or kill the tree? That looks like a lot of pressure to me.

  • iraj

    These are a brutal attack on nature. Do you not know the tree is a living organism that has its roots in the ground and breathing?

  • Kevin Quigley

    Pointless solution to a non-problem that adds nothing to society, which is what I thought the new RCA was all about as they switched from old-school design to new school thinking?

    The apple has fallen very far from the tree.

  • Joshua Brown

    I don’t understand the hatred for this design. It doesn’t harm the tree and encourages people to get up close and personal with the trees instead of viewing them from below. I would think this would encourage appreciation of trees. It is not like every tree would have these stairs, presumably only ones that have a great view at the top. People have used trees for food, heat and shelter since the very beginning, so why must we live separately from them?

  • Stanley

    Trees are becoming fed up with idiotic comments.

  • Deanna R. Jones

    Installing a wooden staircase that leads up to a tree house sounds like a brilliant idea. I remember when I was a kid the way to get up to a tree house was by climbing up some kind of make shift ladder.

    Those ladders are usually pretty unstable, so sometimes either myself or my friends will get hurt trying to climb up or down from the tree house.

    Installing a spiral staircase seems like a much safer way to get up and down a tree house.