This is a variation on the Spiral Explorer I built back a few months ago. The only real difference here is that this one draws shapes at the computed x,y coordinates whereas the other drew lineTo( x, y ).
Just play around with it. Some of the patterns can become quite hypnotic. Something I find effective is to click on one of the slider-thumbs to give it focus and then use the left-right arrow keys to change the value smoothly. The radius delta and constant init are on auto pilot for that very reason.
You can also switch shapes. Rectangles draw fastest so that’s the default. If you really want to watch the animation crawl the switch to ellipse. That requires a heap more cycles to draw. But they’re pretty. :)