The rainbow stairs are a classic, but they’re also not a perfect solution.
They don’t retract, for one thing, and they don’t have a strong adhesive, which means they can’t hold up well against water and snow.
They also don’t do much to prevent water from getting on the underside of the stairs, which could make them vulnerable to damage from rain or snow.
The solution is to build the stairs in a way that can be pulled down.
So far, this has been possible thanks to the work of engineers at the University of Exeter.
Their latest project, a retractable stair that can retract up to six metres, has been demonstrated to work for two metres of height.
The researchers are now trying to build a more versatile version of the system.
In the meantime, the team is making it more affordable, so you can try the stairs on your own, without having to pay for them.