Rolling along.

M/S picture of the earth, a tyre appears around it. M/S of a woman chained to a wheel behind a fire. M/S's of casino wheel, spinning wheel and water wheel. M/S of a woman going round and round in a hoop to exercise. M/S of car wheel. A diagram shows a tree struck by lightening. Various shots of how the wheel developed. Various shots of cars and feet together. M/S of boy tinkering with clock mechanism. A photograph is taken of a rolling wheel to show it moves faster at the top than the bottom. Various shots of wheels on train, bicycle and car. The boy has made a mechanism that has turned his grandfather clock into a speaking clock.