let colors = [];

​

function setup() {

  createCanvas(800, 400);

  noFill();

  frameRate(30);

​

  // Generate an array of random colors for the Northern Lights effect

  for (let i = 0; i < 50; i++) {

    colors.push(color(random(0, 255), random(0, 255), random(0, 255)));

  }

}

​

function draw() {

  background(0);

​

  for (let i = 0; i < colors.length; i++) {

    let r = map(i, 0, colors.length, 0, 150);

    stroke(colors[i]);

    beginShape();

    for (let x = 0; x < width; x += 10) {

      let y = map(noise(x * 0.005, yOff), 0, 1, -r, r) + height / 2;

      vertex(x, y);

    }

    endShape();

  }

​

  // Increment yOff to make the pattern evolve over time

  yOff += 0.01;

}

​