Teapot or art?

Artists, critics and admirers alike have long wondered: What is art? Collectors of ceramics face a slightly more specific question: What is art pottery?

To a collector, the term “art pottery” usually refers to a kind of pottery made in the U.S. from about 1870 to 1930. This kind of pottery usually consists of hand-thrown, hand-decorated vessels with innovative glazes.

The best-known pieces are often…