Rome Auditorium, Italy, competition design , Architect-  Renzo Piano Building Workshop 1992           
The Rome auditoria project houses opera, chamber music and theatrical performances.
The roofs of the halls consist of a number of overlapping doubly-curved plates. These plates are segments cut from toroids of different sizes. The halls reduce in scale sequentially by around 30%. In the original competition design the halls had different forms relating to their size. The halls followed a rule that the bigger the hall the greater the number of facets. This characteristic is found in nature, many exosceletal insects and animals add extra plates to their shells in their period of growth towards their mature state.

images copyright RPBW