the iconic 'Fresco of Good Government'. He guides the reader through Lorenzetti's divided city, where peaceful prosperity and leisure sit alongside the ever-present threats of violence, war and despotism. Lorenzetti's painting reminds us crucially that good government is not founded on the wisdom of principled or virtuous rulers. Rather, good government lies in the visible and tangible effects it has on the lives of its citizens. By subjecting it to scrutiny, we may, at least for a while, be able to hold at bay the dark seductions of tyranny. From fourteenth-century Siena to the present, The Power of Images shows the latent dangers to democracy when our perceptions of the common good are distorted and undermined. It will appeal to students and scholars in art history, politics and the humanities, as well as to anyone interested in the nature of power.