on construction
Because Utzon's original competition design was
short on detail-and because the competition brief
itself was somewhat unspecific-the design of the
Opera House went through many alterations after
Utzon won. Both architect and engineers tried to
find way of working out the geometry of the
roofs. trying ellipses parabola. and other shapes.
before they decided on sections of a sphere
Making the transition from the roofs to the floor
was also a major challenge. Utzon achieved this
at either end of the building with great walls of
glass, which he referred to as glass "curtains"
He also redesigned the hail interiors several
times, but their final appearance owes most
to the team that took over after his resignation