The stunt cleverly tested—and demonstrated—a new dimension in which performance art can gain traction today: as content.

The viral video was not, in fact, the discovery of a painting which was stolen in the still-unsolved Isabella Stewart Gardner ...

"These are commercial art. They were intended to grab us by the lapels and yank us into a movie theatre and say, 'See this film'." But this was also "important art" that went beyond just ...