On a camping trip a while ago, we had a site that overlooked a small, calm lake in the Uintas. From a perch we could toss small rocks into the lake and watch the ripples they created. Tossing two rocks at the same time made it so that we could see what happens when the two sets of waves overlap.

You might want to look at the video up close, or even pause it at certain spots to see what’s happening. What do you observe? What patterns do you notice? Where else could this happen?