Have you ever sat down and just watched the movement of the clouds as time goes by?
On days with only a few clouds, they form slowly. They grow from a single white sliver into a fluffy cotton ball. In the same way they form however they can disappear. As they drift slowly across the sky, they leave thin wisps of fluff behind them. These abandoned wisps dissolve as you watch them. As pieces continue to be removed, the cloud that was once large just disappears without a trace. You have to wonder, who would notice if it had never been formed? Who cared that it was only present for a short amount of time before disappearing; forgotten?