Polygonal Spiral
I saw Alejandro Gallardo's beautiful spirals and had to try some, too.
https://www.geogebra.org/m/arkkxphj B&W
https://www.geogebra.org/m/qwapjezn color
Was just talking to the art teacher in the family about the colors. These are made using HSV and shifting through hues... but I don't really know what to do with saturation and value. These are both at 90%.