Key Hiraga has
been in two exhibitions at MoMA,
between 1966 and 1970.
19 October 1966 to 2 January 1967
William S. Lieberman, Dorothy C. Miller, Shusaku Arakawa and Tadasky (Tadasuke Kuwayama), among others, were involved.
5 June to 13 September 1970
Henri Matisse, Joan Miró, Georges Braque and Oskar Kokoschka, among others, were involved.