London’s National Gallery, one of the world’s foremost art institutions, is itself portrayed as a brilliant work of art in this, Frederick Wiseman’s 39th documentary and counting. Wiseman listens raptly as a panoply of docents decode the great canvases of Da Vinci, Rembrandt, and Turner; he visits with the museum’s restorers as they use magnifying glasses, tiny eye-droppers, scalpels, and Q-tips to repair an infinitesimal chip; he attends administrative meetings in which senior executives do (polite) battle with younger ones who want the museum to become less stodgy and more welcoming to a larger cross-section of the public. But most of all, we experience the joy of spending time with the aforementioned masters as well as Vermeer and Caravaggio, Titian and Velázquez, Pissarro and Rubens, and listen to the connoisseurs who discourse upon the aesthetic, historical, religious and psychological underpinnings of these masterpieces.