code: function start() {
      if (fingers.length === 0) fingers.push(new Finger(), new Finger());
  
      document.addEventListener('mousedown', phantomTouchStart, true);
      document.addEventListener('mousemove', phantomTouchMove, true);
      document.addEventListener('mouseup', phantomTouchEnd, true);
      document.addEventListener('click', phantomClick, true);
  
      document.documentElement.classList.add('_phantom-limb');
    }
docs: On/off switch