The Rainbow Room, Graham Gallery, New York, 21 June–27 July 1966. An exhibition of rainbows, spectrums and prisms with Billy Apple, Martin Canin, Arthur B. Daview, Alfred Jensen, Charles Ross, Lucas Samaras and Mario Yrisarry.
Rainbows: Billy Apple New York, 1965, The Vivian Gallery, Matakana, 8 July – 6 August 2017.
Rainbows 1965, Mayor Gallery, London, 18 May - 27 July, 2022.