script.
  window.canvasOptions = {
    autoClear: true,
    autoCompensate: false,
    autoPushPop: true,
    canvas: true,
    centered: true,
    width: null,
    height: null
  };

let noise = new SimplexNoise();

function draw(e) {
  let xCount = 35;
  let yCount = 80;
  let iXCount = 1 / (xCount - 1);
  let iYCount = 1 / (yCount - 1);
  let time = e * 0.001;
  let timeStep = 0.01;
  let grad = ctx.createLinearGradient(-width, 0, width, height);
  let t = time % 1;
  let tSide = floor(time % 2) === 0;
  let hueA = tSide ? 340 : 210;
  let hueB = !tSide ? 340 : 210;
  let colorA = hsl(hueA, 100, 50);
  let colorB = hsl(hueB, 100, 50);
  grad.addColorStop(map(t, 0, 1, THIRD, ZERO), colorA);
  grad.addColorStop(map(t, 0, 1, TWO_THIRDS, THIRD), colorB);
  grad.addColorStop(map(t, 0, 1, ONE, TWO_THIRDS), colorA);
  ctx.globalAlpha = map(cos(time), -1, 1, 0.15, 0.3);
  background(grad);
  ctx.globalAlpha = 1;
  beginPath();
  for(let j = 0; j < yCount; j++) {
    let tj = j * iYCount;
    let c = cos(tj * TAU + time) * 0.1;
    for(let i = 0; i < xCount; i++) {
      let t = i * iXCount;
      let n = noise.noise3D(t, time, c);
      let y = n * height_half;
      let x = t * (width + 20) - width_half - 10;
      (i ? lineTo : moveTo)(x, y);
    }
    time += timeStep;
  }
  compositeOperation(compOper.lighter);
  ctx.filter = 'blur(10px)';
  stroke(grad, 5);
  ctx.filter = 'blur(5px)';
  stroke(hsl(0, 0, 100, 0.8), 2);
}