Barbican, LondonThough its origins go back more than a decade earlier to a talk he gave in New York, John Cage's Lecture on Nothing was included in his first and most important collection of writings, Silence, in 1961. With its litany of zen-like aphorisms and observations, and increasingly obsessive repetitions that seem to have come straight out of Gertrude Stein, it is a perfect encapsulation of the artistic world…
