A practitioner and a thinker, Hansen
talks about the similarity
of Happenings and collage in his influential book, Al Hansen, A Primer
of Happenings and Time / Space Art, Something Else Press, New York, 1965: The happening, no matter how much it is
rehearsed, is still a curious and unique form
of theater in that one puts its
parts together in the manner
of making a collage.