Throughout his adult life, Cage was also active as lecturer and writer. Some of his lectures were included in several books he published, the first of which was Silence: Lectures and Writings (1961). Silence included not only simple lectures, but also texts executed in experimental layouts, and works such as Lecture on Nothing (1949), which were composed in rhythmic structures. Subsequent books also featured different types of content, from lectures on music to poetry—Cage's mesostics.
