Works by Marcel Duchamp, Henri Matisse, Pablo Picasso, Max Ernst, and numerous other artists are entering the public domain this year as a major trove of copyrights expired in the US on January 1.

It was to be a magnificent stained-glass window that ... that really make it a masterpiece,” says Jodi Pollack, chairman and co-worldwide head of 20th-century design at Sotheby’s.

In the mid-20th century ... of floor-to-ceiling glass. The building was completely transparent. This “showroom” was a ...