They plan to build a twin tower consisting of a 326-room hotel and a 46, 000-square-foot medical center.

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He has twin 8-year-olds, and they need some elbow room, he says.

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But many of the other rooms are not--you can comfortably play billiards on the fine English table, a twin of one at Buckingham Palace, but the library or Jade Room may get a bit sticky.

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There's a private double room, but the shared attic bedroom houses a row of eight twin mattresses lined up seam to seam, which Germans call massenlager mass camping.

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Or book a table next door at one of Asian fusion star Susur Lee's twin establishments: SusUr (picture seven-course tasting menus eaten in a white room fitted with ostrich-skin banquettes), and right beside that, the brand-new Lee (with an equally dazzling, less costly menu).

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His connection was not fast enough to view the live stream of his identical twin Kevin competing in the USA at midnight and he wondered whether he could watch it in my room.

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With a few room alterations along the way exchanging teddy bears for posters, and trading a twin bed for a queen this pattern could take your little cherub from baby teeth and tantrums to unfortunate piercings and term papers.

WSJ: Silly Parent, Good Design Is for Kids | Living Well by Rita Konig