landscape of noise lines

// vertical start
float y = 80;
// vertical displacement between lines
float dy = 1;
void setup () {
  size (800, 600);
  background(100);
}

void draw () {
  // stop drawing before we get out of the screen
  if (y < 500) {
    float lastx = -20;
    float lasty = 0;
    float currx = 0;
    float curry = 0;
    while (currx < width) {
      currx = lastx + 10;
      curry = y + 80 * noise(currx/70, y/70);
      line (lastx, lasty, currx, curry);
      lastx = currx;
      lasty = curry;
    }
    // move down
    y = y + dy;
    // increase line separation
    dy = dy * 1.1;
  }
}