What does a healthy artist look like? Perhaps artists themselves are not the ones to tell us. Oftentimes, it’s true, they have presented themselves as respectable and entirely well-adjusted, suited, or smocked, standing at the easel with palette in hand. But the more indelible images left to us by art history, particularly since the onset of Romanticism in the nineteenth century, are more vivid and less peaceful of mind. Take, for example, Theodore Géricault, an early nineteenth-century painter who defined the Romantic sensibility both in his work and life. In one of his earliest works, Géricault showed himself slouched in a chair with a skull perched on the shelf above him. The pictorial analogy between his own youthful, handsome visage and the death’s head was clear: the artist was haunted by his own eventual demise. In 1824, shortly after completing a series of sensitive portrayals of “monomanics” (the inhabitants of asylums), which form a visual canon of mental disturbance, he would make good on the prediction of his early self-portrait, showing himself hollow-eyed and ghoulish, a dying man, as indeed he was. Géricault was soon to pass away at the age of thirty-two of tuberculosis....