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Frederick Hammersley Up Down Stick USA, 1970 computer-generated ink drawing on paper 11 h x 14.75 w inches Signed, titled and dated to lower edge 'F. Hammersley Up Down Stick 21 Feb 70'. Literature: Frederick Hammersley: The Computer Drawings 1969, East, pg. 36 Provenance: L.A. Louver, Venice, CA | Private collection