9 Evenings was the first large-scale collaboration between artists and engineers and scientists. The two groups worked together for 10 months to develop technical equipment and systems that were used as an integral part of the artists’ performances. Their collaboration produced many "firsts" in the use of new technology for the theater, both with specially-designed systems and equipment and with innovative use of existing equipment. Closed-circuit television and television projection was used on stage for the first time; a fiber-optics camera picked up objects in a performer's pocket; an infrared television camera captured action in total darkness; a Doppler sonar device translated movement into sound; and portable wireless FM transmitters and amplifiers transmitted speech and body sounds to Armory loudspeakers.
The 9 Evenings: Theatre and Engineering DVD Series (director: Barbro Schultz Lundestam) is an important documentation of the collaborations between the artists and engineers that produced innovative works using these emerging technologies. The Swedish journalist and movie/documentary director Barbro Schultz Lundestam visited Billy Klüver and his wife, Julie Martin, in New Jersey in 1993. The couple showed her their archives of the E.A.T. projects, including manuscripts, photographs and 16mm film recordings on 9 Evenings. (Julie Martin and Billy Klüver had met during rehearsals for 9 Evenings, since she was an assistant to Robert Whitman for his performance.) Robert Rauschenberg asked Schultz Lundestam to work on the old film material. She completed 10 documentaries.