'Over, Under, Next' at the Hirshhorn: Art review

Just about a century ago came one of those seemingly small innovations in art that unleashes epochal forces of transformation. In 1912, Georges Braque began using paper and fabric on the surface of his paintings, inaugurating not just a technique, but a form, the "pasted paper" work. The surface of the image was suddenly a thing to be played with, and a host of ancient assumptions, and categories, began to fall apart. A new exhibition at the Hirshhorn Museum explores the viral spread of this one...