Brother and sister duo, Benny and Betty Fox, dance on a small platform that hangs out a window 20 stories high in a building in Chicago. WS and aerial of them dancing and doing a dangerous trick. Montage of workers building statues and buildings for a fair in San Francisco. CU of sculptors working on the large statues. WS of a man strapping himself into a hand glider and taking off down a field close to the ground.