Located in the Palais du Louvre’s western wing, the Musée des Arts Decoratifs features decorative arts—objets, furniture, tapestries, wallpaper, tableware, and intact historic rooms (fashion designer Jeanne Lanvin’s hyacinth-blue boudoir! her burlwood bathroom!) that date from the Middle Ages to the present day. This virtual walk-through is a chance to see superb design at close range and without the usual crowds. —E.C.