Studying an artwork is an exercise in seeing and comprehension, two activities that are the foundation of connoisseurship—the art and science of the identification and evaluation of the qualities of works of art. This catalogue, which accompanied an exhibition of American art at the Yale University Art Gallery, asks how a viewer goes about determining the authenticity of an artwork. Genuine works of art have a complex relationship with their replicas, and the publication also emphasizes the continuity that links objects made in the past to those made closer to the present. Catalogue entries place modern copies alongside their historical counterparts, using this comparison as a basis for discussing the relationship between the two objects.