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Tony Smith’s Gracehopper, 1961/1988: “I was first introduced to Tony Smith’s work when I was working at Wright. Four yellow-painted cardboard models came up for auction and I thought they were the coolest things. The titles of all four were ‘Yellowbird,’ and they were formed from a series of tetrahedron cells. This had an early effect on my work — I was instantly sucked into the endless systems that geometry provides.”