Instructions shown when flag clicked I was observing my two-day-old brine shrimp larvae (they are adorable in a way not all people understand) when I started thinking about how they were gathered at the edges of the container more than the center, which led to some thinking about what patterns they move in. So this project fell out. The behavior isn't particularly realistic because I chose the lazy, not-so-mathematical way out, making speed unaffected. I may change the math later. Updated slightly; now if you hold down long enough it starts making many larvae.