A Life in Lines and Light Washington, D.C. provides the backdrop for the life of Charles Dunn. Born in 1895, he moves through the early decades of the twentieth century not merely as a painter, but as an illustrator and a cartoonist. His hand is as comfortable with the sharp, satirical edge of a caricature as it is with the soft, fluid wash of a watercolor. There is a certain versatility in his output, a capacity to shift from the obs…