Take one majestically ruined Viollet-le-Duc castle in central France, and simply add a c21 slate sundial of rather unsatisfactory design, fix it to a medieval wall with badly-chosen B&Q screws, and you get this…  Viollet violated.

Actually, I’m being a bit harsh on it. Looking closely, including at the gnomon, the dial  seems to be home-made by someone who knew what he was doing. The carefully sketched light markings indicate that he (or she) has taken a lot of trouble over it. Had I made it myself, I’d be proud of it. But I might have located somewhere less blatantly out-of-place (and maybe with different screws…).