The Romans were not inventors of the supporting arch, but its extended use in vaults and intersecting barrel shapes and domes is theirs.

And that also gives you greater freedom of the shapes that you can use. Harry Seidler Australia Square MLC-Center 1980 ISBN 3-7828-1457-6
Kenneth Frampton: Harry Seidler Riverside Centre Horwitz Graham Sydney/ Karl Kraemer Stuttgart 1988 ISBN 0-7255-2056-6
Kenneth Frampton Philip Drew: Harry Seidler: Four Decades of Architecture Thames & H.

Harry Seidler AC OBE (25 June 1923 – 9 March 2006) was an Austrian-born Australian architect who is considered to be one of the leading exponents of Modernism's methodology in Australia and the first architect to fully express the principles of the Bauhaus in Australia. Seidler designed more than 180 buildings and he received much recognition for his contribution to the architecture of Australia.