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At Brasilia Niemeyer must still design theaters, stations, airport buildings, must approve every private venture, find materials, supervise all projects. For the city's 3,000-seat cathedral, he plans a tepee of concrete poles 220 ft. high, sheathed in translucent plastic and stained glass. "Brasilia," says Niemeyer, "begins a new phase in my work, more geometrical, more simple, more monumental." Post-Brasilia outlook: "I have not thought about it. I suppose I will have to start my life all over again."