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It was during this time that his ideas of Rain, Gladness and Zero, which defined his conceptual art, emerged. He used various media to unfold these ideas, beginning with artist books, the typewriter, postcards, rubber stamps, and photos, as well as using and combining various printing techniques.
Later he expanded his range of chosen media by including actions and their documentation as well. The first artists book marked not only the closing of an era, but also the first expressions of his defining idea of nothing, or absence. Zer0, which simultaneously communicated absence and presence, first made its appearance in the artists mail art works.