The homes of the Himba, who number between 30, 000 and 50, 000, are round structures constructed of sapling posts, bound together to form a domed roof which is plastered in mud and dung.

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If you believed the argument in its most simplistic form, property prices should have gone through the roof in Japan since 1995.

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That proof of residence is a critical document, and for many the only form of identification: Besides serving as proof of nationality and getting you a new roof over your head, it can help you get discounted provisions at government-run stores, a phone and utility hookup and a voter registration card.

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The steel structure will form the basis of the 11, 000 sqm (118, 400 sq ft) column-free roof.

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