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Willem de Ridder. 14 Operations for 2 Players and Tape Recorder (14 handelingen voor 2 spelers en bandrecorder), 1961. Typewriting, ink, and pencil on graph paper, sheet: 14 1/2 x 5 3/4" (36.9 x 14.6 cm). The Gilbert and Lila Silverman Fluxus Collection Gift, 2136.2008. (Photo: MoMA)