I just don't understand how you can restrict photography of something that's in the public view. I'd expect that while most public sculptures etc are copyrighte

I just don't understand how you can restrict photography of something that's in the public view. I'd expect that while most public sculptures etc are copyrighted, this restricts reproductions of the sculptures themselves, not images of them. The creative work here is the lighting system, and I don't feel an image of that actually copies that.