Based on a pattern I came up with while playing with sidewalk chalk with my girls. I like that this can be drawn in one continuous path from the inside to the outside. Works well with a new, sharp piece of chalk that can draw wider lines as it wears down toward the outside of the pattern. There is no obvious stopping place, but it can be paired with another similar one to make a s-type spiral pair. Here, I have let it fade as it gets bigger to give it finite scale.