The swimming pool: Laurie Taylor explores its iconic role in our culture, as well as its unspoken rules, routines and rituals. Piotr Florczyk, forming swimming champion and Assistant Professor of Global Literary Studies at the University of Washington, considers the allure of an azure pool and its place in our cultural imagination, from the Hollywood movie, Sunset Boulevard, to David Hockney's pool paintings. He also asks 'who has access to the pool' and charts North America's shifting attitudes towards race and recreation which turned public bathing into an explosive issue, one leading to violence, segregation and the flight to white suburbia. What is the future of the pool given water shortages and climate change? Also, Susie Scott, Professor of Sociology at the University of Sussex analyses the unspoken social norms which govern swimmers behaviour, including a respect for personal space, a shared disapproval for the 'hairy torpedo' and the firm refusal to notice 'the elephant in the room' - the fact that we are nearly naked. Producer: Jayne Egerton