Environmental theatre blurs the distinctions between acting space and audience space

In 1959, Happenings were pioneered by the painter Allan Kaprow. They included several environments and uses of multimedia. Which of the following is NOT a common characteristics of Happenings? a. They often made each participant a partial creator of the event

b. They sought to provide an experience rather than present a message or single meaning. c. They often asked audience members to contribute cash donations instead of charging ticket prices. d. They broke down barriers between the arts and mingled elements.

Which is another term for Comic Opera?