I watched the ripples of raindrops in puddles as I ran on Monday. Those ripples stuck in my mind through today and I decided to tinker with a circle toy. Click to add dark and move your mouse around to draw. This is the result for day 3 of 101 DoCC. I call this moireCircles. It may not work well with touchscreens.
See the Pen moireCircles_Day3 by Sophia (@fractalkitty) on CodePen.