Observadores

• 

  Nicolas Mackintosh

  https://okzoa.net/%ED%94%8C%EB%9D%BC%EC%9B%8C-%EB%A9%94%EC%9D%B4%EC%A0%80%EC%82%AC%EC%9D%B4%ED%8A%B8-%EC%95%88%EC%A0%84%ED%95%9C-%EC%9D%B4%EC%9A%A9%EB%B2%95/