Snow - OpenProcessing

mySketch
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function setup() {
  createCanvas(windowWidth, windowHeight);
  background(100);
  frameRate(3);
​
}
​
function draw() {
  background(100);
  
  for (y=10; y<height; y+=random(100)) {
    for (x=10; x<width; x+=random(70)) {
      noStroke();
      fill(255, random(50));
      ellipse(x, y, 50, 50);
    }
  }
  
  for (y=10; y<height; y+=random(90)) {
    for (x=10; x<width; x+=random(60)) {
      noStroke();
      fill(255, random(60));
      ellipse(x, y, 10, 10);
    }
  }
​
  for (y=10; y<height; y+=random(50)) {
    for (x=10; x<width; x+=random(100)) {
      noStroke();
      fill(255, random(70));
      ellipse(x, y, 20, 20);
    }
  }
  
  fill(255, random(50));
  noStroke();
  ellipse(noise(millis())*width, noise(millis()-10)*height, 20, 20)
}