For the past few years Tate Modern has been the preeminent modern art museum. But the new Museum of Modern Art will reclaim the title soon. “As a theatre of contemporary art, Tate Modern is exceptional. But as a place where we can learn why Picasso matters, it fails – and wants to fail. A couple of weeks from now, Moma will once again be the place to learn about 20th-century art. Maybe Tate Modern can never tell the story of the modern world’s art as well as Moma; but it could try.”