Other works completed in this period include a series of Crystal Boxes, containing constantly transforming crystals; a performance and lecture 'with slides, music and fireworks' called "The Chemistry of Music" given at the ICA; "The Brunch Museum", an exhibition dedicated to relics associated with the (fictional) character WE Brunch; a play entitled 'Silent Music' broadcast on West German Radio as part of celebrations for John Cage's 75th birthday; and 3 large sculptures, called "Void Stones", commissioned for the "Skulptur Projekte Münster".