I was looking at a small well-rounded stone on the beach yesterday.
If I took that stone and rolled it once, I wouldn't be able to perceive any change to it. Yet that stone was part of a much larger piece of rock. It was broken off, then rolled until it became smooth. At times, that stone likely sat still for thousands, hundreds of thousands, or even millions of years without being moved; but it was moved enough to be worn smooth and round yesterday.