More spirographs.

spiro2.js

var n = 7;
var angles, speeds, lengths;

function setup(){
    createCanvas(window.innerWidth, window.innerWidth);
    background(255);
    fill(0, 20);
    frameRate(9999);
    
    angles = [];
    speeds = [];
    lengths = [];
    
    for (var i=0; i<n; i++){
        angles.push(0);
        speeds.push(random(1) < 0.5 ? (i+1) * (i+1) * -PI/(8*360) : (i+1) * (i+1) * PI/(8*360));
        lengths.push(width/((i+1) * 8));
    }
}

function draw(){
    translate(width/2, height/2);
    rotate(-PI/2);
    
    for (var i=0; i<n; i++){
        rotate(angles[i]);
        stroke(0, 4);
        if (i > 0) line(0, 0, lengths[i], 0);
        translate(lengths[i], 0);
        noStroke();
        ellipse(0, 0, 2, 2);
        angles[i] += speeds[i];
    }
    
    if (angles[0] >= TWO_PI || angles[0] <= -TWO_PI) noLoop();
}