With his publishing company, Tōmatsu also conceived the cultural magazine "KEN." Each of the three issues was edited by a different artist: the first, second, and third edited by Yoshio Sawano, Masatoshi Naitō, and Tsunehisa Kimura respectively. "KEN" addressed concerns over a growing fascist tendency in Japan and expressed criticisms about the 1970 World Fair held in Osaka. Essays, both textual and visual, were contributed by Provoke members and other prominent Japanese photographers including Masahisa Fukase and Kazuo Kitai.