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A monthly contest from the editors of RECORD asks you to guess the architect for a work of historical importance.

Clue: This factory, built by a prominent European car manufacturer in the early 20th century, operated on a unique principle: an assembly line conceived as an elongated upward spiral from which completed vehicles would emerge on the building’s rooftop. There, they were put to the test on a racetrack more than half a mile long.

By entering, you have a chance to win a $500 Visa gift card. Deadline to enter is the last day of each month at 5:00pm EST.

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Last month's answer: The Torre Agbar, now known as the Torre Glòries, was designed by Jean Nouvel to serve as the headquarters of a large utility company. Standing as the third-tallest building in Barcelona, the 470-foot-tall polychrome tower gently references the soaring exuberance of Antoni Gaudí and other historic Catalan architects.

Photo courtesy David Iliff (Creative Commons License)