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Description: The price of urban land is skyrocketing. And another 3 billion people are expected to live in cities: we will be forced to exploit vertical space: More and taller towers, the use of attics and roofs: we need to get up high.n nYet, our populations are ageing and staircases become major bottlenecks, while being unattractive at greater heights for all . Lifts are rarely a good alternative as they rely on significant external power, they deprive us from daily exercise and are expensive and intrusive
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