Art history is haunted by the foil: the dark star whose diminished luster sets off another's brilliance. Relegated to this role by modern historians of Revolutionary-era French art, François-André Vincent (1746-1816) is chiefly viewed in the reflection of his contemporary, Jacques-Louis David. The Perfect Foil frees Vincent from this distorting mirror. Offering a nuanced and historically accurate account of Vincent's life and work, Elizabeth C. Mansfield...