Long ago in China, there was a little boy who lived a nomadic life with his family. Hunger and hardship followed them wherever they went. They tried to grow food once, but whenever the seeds were sown, winter came and all the seedlings became frozen. One day, while passing by the Yellow River, the boy's white horse suddenly got free of the reins and plunged into the river. After a while, the horse sprang out of the water with a drawing on its back. Everyone wondered what the drawing meant, but only the boy was clever enough to figure it out and explained to his family: "This drawing shows the cycle of the changing seasons. The horse wants to help us grow grains to make food. Why don't we do what is on this drawing and sow seeds in the spring, water them in the summer, and harvest in the autumn. In the winter, we need to let the earth rest."