The Cass Foundation exists to cultivate a new tradition of British sculpture by commissioning original work from young artists, exhibiting and selling the resulting pieces and re-investing the proceeds in further patronage. This project creates a new facility to host seminars and events, exhibit works of sculpture, house the archives and library and provide workspace for its administrators. A trapezoidal plan echoes the sculpted hollow in which it sits. The building is presented as a single storey, sedum-topped plinth with the upper section of the hall expressed as a separate cedar-clad lantern when approached from the west. Only from the other side does its relationship to the hall become clear through the double height glazed screen.