CanopyStair is a spiral staircase that straps around any tree trunk.
(via DeZeenMagazine)
 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.
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.
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.
"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.
"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.
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.
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.
"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.
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 mesmerizing."
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. 
Photography is by Tony McIntyre.