In many cases, that means replacing a round pipe with a wide concrete box-like structure.

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The box-like eight-floor structure had dark brown bricks as facing tiles on the outside walls, a style that became popular in Shanghai in the 1930s.

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Special exhibits are housed in Rem Koolhaas' high-tech "black box" structure, which allows no outside light to penetrate.

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Providing performance picks up it could yet become an example of a hedge fund that is capable of making profits year in, year out, with a long-term ownership structure: a formula as elusive as that behind any black-box trade.

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You may also have to do some out-of-the-box thinking, examining your current business structure to see if there are any areas with unnecessary costs.

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We tore down the structure and put up a 16-by-30-foot glass box.

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