Produced as a diploma project in 1928, it justified itself by pointing out – as generations of environmentalists would later insist – the need to minimise human impact on the planet. Except rather than treading lightly on it, we wouldn't be treading on it at all, but living in flying mobile homes, which could dock at collective housing, hotels, factories and leisure centres, able to descend to the earth to enjoy it unspoilt. — guardian.co.uk