fullscreen int t,i,w=255,a[]=new int[w*w];
void draw(){
background(w);smooth();beginShape(17);
a[t]=mouseY;a[t+1]=mouseX-w;
for(i=0;i<t;i+=2)
vertex(w+cos((t-i)/99f)*a[i+1],a[i]);
if(a[t]>0)t+=2;
endShape();
}
Click into the big white are, and use your mouse to draw rotating shapes.
If you made something nice, make a screenshot.