The ripple effect. It happens all the time. A small thing that escalates into something huge. Eventually though, the ripple recedes and the water becomes still. That's only the case in water. A lot of times, things stay for much longer. Sometimes, everyone watches the ripples move out. Sometimes, everyone only sees the first drop - but they miss the rest. The rest is seen by one person.
Ripples can make good change. A small idea that becomes a big thing that is beneficial. They can also be the opposite.