Why Is Donald Judd Considered a Sculptor?

The space at the top of the escalator leading to the Museum of Modern Art’s sixth floor is typically a crowded gift shop. When I visited the museum in early March, that space had been transformed. Instead of art-related trinkets, posters, and postcards, there was a neat display of boxy pine furniture and carefully arranged books with monochrome covers. This was the introduction to “Judd,” the first retrospective dedicated to Donald Judd in the United States since 1988. The furn