MARCH 2015 CLUE: A well-known follower of Mies veered toward apostasy by incorporating semi-classical motifs into his work, as at this museum. Forty years later he expanded the building in a straightforward modernist manner.

MARCH 2015 ANSWER: The answer to the March issue’s Guess the Architect is Philip Johnson, who designed the Amon Carter Museum in 1961. In 1977, he and partner John Burgee expanded it; then, in 2001, Philip Johnson/Alan Ritchie Architects enlarged and reworked the museum yet again.