Inside a church in east London, a clown called Mattie Faint is clutching a very special kind of egg. Daubed onto its surface is a studiously rendered, if somewhat rudimentary, portrait of a clown’s face. It’s one of many ceramic eggs that Faint keeps safe – they are vitally important to their owners. Faint is the curator of the Clowns’ Gallery, a museum based at Trinity Church in London’s East...