When you walk in nature around this season, you will find many fallen leaves on the ground. They make a pile after blown by the wind. If you step on them, they make dry sound and amuse your ears.
The leaves just fell from the tree are still remain moist. They still contain water within them. The water makes the color in the leaves. After they stay on the ground for a while, the sun will dry the leaves.
The ground also absorbs the water from the leaves, but some water stays with the leaves until they become into very small pieces. By then, the color has been disappeared.
The leaves keep their original shapes as long as the water stays with them.
