They want about 4, 000 tombstone-like concrete columns of differing heights spread over the site.

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Oxman estimates that making concrete columns this way with low-density porous concrete in the center could reduce the amount of concrete needed by more than 10 percent, a significant savings on the scale of a construction project.

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In the first-floor gallery, free-standing marble statues of men, women and horses glow against a background of grey concrete walls and columns.

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Conversion seems to be a big problem: in the case of the Sungshan complex, which collapsed into itself, the superintendent of the residential part of the building says a bank that rented out the first two floors had stripped the steel columns of concrete reinforcement during renovations earlier this year.

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It also shows columns missing chunks of concrete and police talking to building operators.

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