code: function wrap(body) {
      var p = body.getPosition();
      p.x = wrapNumber(p.x, -SPACE_WIDTH / 2, SPACE_WIDTH / 2);
      p.y = wrapNumber(p.y, -SPACE_HEIGHT / 2, SPACE_HEIGHT / 2);
      body.setPosition(p);
    }
docs: If the body is out of space bounds, wrap it to the other side