Concrete and memory
Larry says his fascination has been less about concrete's form and more about its surface, the interface between your senses and its mass and the very personal memories that creates. He talks often of early memories of the feel of weather beaten concrete under foot around rockwalls near the ocean. They have done many concrete projects over the decades however recently they reconstructed the weather worn concrete with a simple but deliberately rusticated garden step. The feeling it creates makes memories. Concretes ability to weather is still being researched and we have even forgotten much about it.
http://www.independent.co.uk/news/science/roman-concrete-mystery-solved-scientists-a7824011.html