Stieglitz's mask offers a further perspective on African art.

WSJ: Americans' African Inspiration | African Art, New York, and the Avant-Garde | Metropolitan Museum of Art | By Michael FitzGerald

"Collage is the most important innovation in art since perspective was discovered in the fourteenth century, " he proclaims at one point.

WSJ: Book Review: Bad Boy

Usually viewers are the ones that look at art, but what we are trying to do is reinvert the viewing perspective so it's the art object that is doing the viewing.

WSJ: Public Arts Projects Twist the City's Skyline