Binishell Dome at Broadmeadow High. Apparently, these literally sprung up around the world and several were built for our high schools as a quick fix (looking not unlike an unwelcome war base)
Yes, another Italian, clever with concrete, Dr Dante Bini, uses a gigantic balloon and a robot to inflate the concrete load to form the shape. (ref Feb 1)
He has also set his sights on similar innovations to small-scale low-cost housing so as to ease housing crises around the world.