"Maria Callas once said, 'When you perform, half of the brain has to be in complete control and the other half of the brain has to be at a complete loss.'"
- From an interview with Marina Abramovic, performance artist

"In April 1981, at my request, my mother went to a detective agency. She hired them to follow me, to report on my daily activities, and to provide photographic evidence of my existence."
- Sophie Calle, from her photographic series The Shadow