“The purpose of art is not to create a literal, documentary-style reproduction of a scene from real life. “The artist must open our eyes to what unaided we could not see, and in order to do so he often needs to modify the familiar appearance of things and so make something which is, in the photographic sense, a bad likeness.” The greatest artists teach us how to perceive through the use of expression and decoration. They are scientists, manipulating color, line, light, space, and mass in ways that reveal human nature. “The artist gives us satisfaction by seeing far more clearly than we could see for ourselves.” A great painting should be more than a sum of technical beauty. At the Barnes, we were taught to look for delicacy, subtlety, power, surprise, grace, firmness, complexity, and drama—but to do so with a scientist’s eye.”