Great art is about emotion. In the eighteenth century, and especially for the English stage, critics developed a sensitivity to both the passions of a performance and what they called the transitions between those passions. It was these pivotal transitions, scripted by authors and executed by actors, that could make King Lear beautiful, Hamlet terrifying, Archer hilarious and Zara electrifying. James Harriman-Smith recovers a lost way of appreciating theatre as a set of transitions that produce simultaneously iconic and dynamic spectacles; fascinating moments when anything seems possible....