Silver Clouds

"RainForest" differed from Cunningham’s other pieces in that, with the exception of Cunningham, each of the six dancers performed his or her role, then left the stage and never returned. Andy Warhol agreed to let Cunningham use his installation "Silver Clouds"--a number of Mylar pillows filled with helium, so that they floated freely in the air"

http://www.mercecunningham.org/index.cfm/choreography/dancedetail/params/work_ID/90/