WASHINGTON (AP) — The National Building Museum is hosting an exhibit about a little-known craftsman whose work with tiles graces many of the greatest public buildings, from the Supreme Court to New York’s Grand Central Station.

Rafael Guastavino immigrated to the United States from Barcelona in 1881 and patented a tiling method based on a Spanish technique that’s hundreds of years old. His company went on to help define American architecture in hundreds of buildings with decorative tile ceilings.