Many of these great stadia catered for both American football and baseball (and usually other types of activity) in an attempt to maximize revenue. However, as already mentioned, the shapes of foot- ball and baseball pitches are so different that it is difficult to provide ideal seating configurations for both, even with movable seating systems as in the John Shea dual-purpose stadium of 1964. The Harry S Truman Sports Complex in Kansas of 1972 there- fore separated the two sports: the Royals Stadium overlooks a baseball pitch (Figure 1.13), and its sis- ter Arrowhead Stadium a football field (Figure 1.14), each of them being shaped to suit its particular sport. Each stadium has its own entertainment facili- ties, etc. for its particular group of patrons.