Generative artwork, floating and fading.

let gray = amt => color(amt, amt, amt);

function setup() {
  randomSeed(7);
  createCanvas(600, 600);

  for (let i = 0; i < 200; i++) {
    x1 = randomGaussian(300, 120);
    y1 = randomGaussian(300, 50);
    y2 = randomGaussian(300, 50);
    fill(gray(x1 / 600 * 255));
    line(x1, y1, x1, y2);
    ellipse(x1, y1, 20, 20);
    ellipse(x1, y2, 20, 20);
  }
}

(View full source at https://repl.it/@BrockWilcox/Transition)