 In New-York (1965) in Flux Hall "Memoriam of Adriano Olivetti," "Rainbow Staircase Environment, 363 Canal Street, New York, November 20" , "Rainbow Music #1," Tokyo (1966) "Happening for a sightseeing bus trip in Tokyo" with its movie on the Museum of Modern Art website , Fukui (1986) Rainbow Happening #16, a 25-meter rainbow in the Eiheiji Temple, Paris (1987) Rainbow Happening #17.A happening was part of his 2012 retrospective, and for the Rainbow Dinner the same year.Organised by Ay-O the rainbow pro-eminently figures in such happenings.