While visiting a church in Guadalupe in 1917, David Alfaro Siquieros, the great muralist painter of the Mexican Revolution, found, “along with broken candelabras and other typical church adornments,” a “true mountain” of small paintings tossed carelessly on the floor. He picked one up. It was “made of paper . . . painted with colored pencils but especially interesting, perhaps more primitive than the others, almost as if executed by a child.” And, thinking he was doing nothing wrong, he took it. A priest, witnessing the scene, shouted, “Thief!”—and armed sacristans dragged him off to the station.