The empty space, in conjunction with ubiquitous reds, makes this one of the strangest, most disturbing paintings in the Western canon. Félix Vallaton, La Chambre Rouge, 1898. Lausanne, Switzerland, Musée Cantonal des Beaux-Arts. © AKG Images.

The empty space, in conjunction with ubiquitous reds, makes this one of the strangest, most disturbing paintings in the Western canon. Félix Vallaton, La Chambre Rouge, 1898. Lausanne, Switzerland, Musée Cantonal des Beaux-Arts. © AKG Images.