Architecture..FORM and SHAPE

The architect of the Sydney Opera House is Jorn Utzon. In my opinion its a masterpiece. BUT what I'm interested in is what inspired his work to produce these shape and form, which are know throughout the world as the sydney opera house. In fact its an expressionist design, of a series of large precast concrete "shells". According to sources the shell like exterior is suppose to represent the sails of the tall sailing ship that brought so many modern anglo residents to the country.