events included the release of 1,974 rainbow trout into the Spokane River, and releasing 1,000 pigeons into the sky. The fair Nations with an official presence at the fair included Australia, Canada, West Germany, Iran, Japan, Taiwan, Republic of Korea, the Philippines, the United States and the USSR. Architectural critics were intrigued by the Australian Pavilion with its 36 screen revolving audio visual platform and a model of the newly completed Sydney Opera House. (The artistic director for the project was film director Jonathan Dawson). However, writer Calvin Trillin tartly commented that the exhibits of several other countries seemed designed to demonstrate their nation's lack of environmental care. "While other world's fairs had introduced the telephone, the escalator, and the Belgian waffle, Spokane's Expo '74 would be associated forever with the 'institutionalized mea culpa,'" Trillin wrote in The New Yorker. One piece of technology that made its debut at Expo '74 was the IMAX movie theater. The original theater, built inside of the United States Pavilion, had a screen that measured , completely covering the front wall of the pavilion. It was the largest indoor movie screen at the time and had bigger dimension than a typical drive-in movie screen. 'The quote, "The Earth does not belong to Man, Man belongs to the Earth" (attributed to Chief Seattle) was written in large letters on the outside wall. Inside the pavilion, visitors watched "Man Belongs to the Earth," a 23-minute IMAX film made for Expo by Paramount. Scenes of U.S. splendor led into environmental problems including air pollution in Denver. The film was so realistic—especially during a sequence flying through the Grand Canyon—that motion sickness bags had to be made available.' The fair also featured the interactive movie system Kinoautomat. Pacific Northwest Bell had a pavilion that eliminated the use of air conditioning by using louvered panels on the roof. They demonstrated the use of TTY equipment and discussed the use of 911 for emergency telephone services. Expo '74 was the last time that the Bell system would exhibit at a world's fair before its breakup ten years later. Legacy After the event closed, the exposition site became the city's Riverfront Park, containing the former U.S. Pavilion and a clock tower (part of a Great Northern rail depot that was demolished for Expo '74), which are featured prominently in the park's past and current logos. Several structures built for the fair