function setup() {

  createCanvas(windowWidth,

               windowHeight);

  background(1, 1, 1);

}



function draw() {

  var from = color(100, 100, 300,800);

  var to = color(500, 500, 500, 500);



  fill(lerpColor(from, to, random(1.0)));

  rect(random(width), random(height), 40,1000);

}