E.A.T. supervised the testing and installation of a Cloud Sculpture by Fujiko Nakaya as a set for the dance  Opal Loop, for Trisha Brown Dance Company. In 1980 Trisha Brown asked Nakaya to make a set for a new dance, Opal Loop. Nakaya designed a system for making a stage of fog for the dance, the volume and movement of the fog were controlled by turning sets of nozzles off and on to create convection currents. The dance was first performed in an former DC power station on Lafayette Street in Manhattan.

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Later Brown included Opal Loop in her program at the Brooklyn Academy of Music. Billy Klüver and his neighbors built a replica of the Brooklyn stage in his backyard and tested the fog system before moving into the theater. Since the dancers could not dance on a wet Marley floor, E.A.T. rented a large gas-driven heat blower, used in football stadium dugouts, and put it underneath the stage to raise the temperature of the floor so the fog droplets evaporated immediately, keeping the floor dry.