createCanvas(800, 600);

  background(50);

  colorMode(HSB);

  noLoop();

}

​

function draw() {

  noStroke();

  // fill(255,20,100,50);

  let shift = 0;

  for (let y = 300; y<= 500; y+=1) {

    for (let x = 100; x <= 500; x += 1) {

      let altitude = 200*noise(x/200,y/200);

      altitude += 30*noise(x/30,y/30);

      let hue = map(altitude,0,230,100,360);

      let brite = map(altitude,0,230,0,100);

      let sat = map(y,300,500,10,100);

      fill(hue,sat,brite,0.3);

      ellipse(x + shift, y - altitude, 2);

    }

    shift += 1;

  }

}

​