Rana Mitter talks to the playwright Peter Nichols as his 1981 Passion Play opens again in the West End with Zoe Wanamaker as the betrayed wife Eleanor. In his latest book Strictly Bipolar, psychoanalyst Darian Leader looks at the cultural setting for bipolar disorder, and suggests a new way of making sense of the condition. And the architect Sunand Prasad and critic Rowan Moore discuss meaning in architecture and the role of the audience - or the public as we call them when discussing buildings rather than plays - in creating that meaning.