One of the great things about art is, that no matter how tired your feet, no matter how many gentlemen's portraits you have seen, or how many miles of corridors you have tramped down there is always the chance that you will round a corner and see a picture of dancing rats.
Image: The dance of the rats by Ferdinand Van Kessell c.1690, Stadel Museum Frankfurt
Image: The dance of the rats by Ferdinand Van Kessell c.1690, Stadel Museum Frankfurt