void setup() {
  size(400, 400);
  background(0);
  stroke(255);

  float x = width / 2;
  float y = height / 2;

  for (int i = 0; i < 2000; i++) {
    point(x, y);
    x += random(-5, 5);
    y += random(-5, 5);
  }
}