a famous feature of the national theatre's olivier stage is its
Royal National Theatre Named after the theatre's first artistic director, Laurence Olivier, this is the main auditorium, modelled on the ancient Greek theatre at Epidaurus; it has an open stage and a fan-shaped audience seating area for 1100 people. A 'drum revolve' (a five-storey revolving stage section) extends eight metres beneath the stage and is operated by a single staff member. The drum has two rim revolves and two platforms, each of which can carry ten tonnes, facilitating dramatic and fluid scenery changes. Its design ensures that the audience's view is not blocked from any seat, and that the audience is fully visible to actors from the stage's centre. Designed in the 1970s and a prototype of current technology, the drum revolve and a multiple 'sky hook' flying system were initially very controversial and required ten years to commission, but seem to have fulfilled the objective of functionality with high productivity.[10]