The artist noted the significance of showing in New York "Precious Stonewall" (2010), a block tower of blown-glass bricks draped in beads hand-cut in India.

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Instead of pumping carefully metered quantities of the solution into the tower, the operators were instructed to mix it by hand in what were, in effect, ten-litre stainless-steel buckets.

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Every time the tower was reduced to rubble and dust, the face belonging to the hand would appear.

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On the other hand, NCR could use the same back of the house strategy and the Tower to gradually pick off the registers from competitive installations.

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Sometimes a big blue hand would come down out of the sky and sweep away one or more levels of the square tower, or even the whole thing.

NEWYORKER: Ziggurat