The knee plays

"the Knee Plays is a series of brief encounters which, as a group, tells a tale of a tree, a boat, and a book. The three to six minute plays are designed to be set between the fifteen fully staged scenes of Robert Wilson's epic opera. ... For a presentation of the complete opera, each knee play would be performed as an entr'acte downstage in front of a white scrim during the massive scene changes."--Page 5.