In Monty Python's film The Life Of Brian, when John Cleese asks what the Romans have ever done for us, apart from sanitation, medicine, education, irrigation, public health and roads, he forgot to mention the invention of concrete. So reminds Sarah Gaventa, design historian, author of the recently published book Concrete Design and one half of Scarlet Projects, the initiators and curators of the Royal Institute Of British Architects' major new exhibition, Hardcore! Concrete's Rise From Utility To Luxury.