In order that the foil does not fall apart, each transparent ring is actually a series of curved slots in the copper rather than a continuous gap.
ECONOMIST: The search for alien life
They want to provide a series of incentives to mine owners and firms which make gold as a by-product of smelting copper ore.
BBC: Golden opportunity for old Indian mines
On one long wall is a series of enormous, predominantly white paintings by Robert Ryman and Andy Warhol and a mirror-finished copper work by Donald Judd, like a polished jewel among them.
WSJ: New Guggenheim: Art and Architecture as One | By Ada Louise Huxtable
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