You compose your shot, get things lined up and then a red truck pulls up. But then, maybe it does not ruin the shot... it provides some balance in a way.
This is the Memorial Art Gallery in Rochester NY, a nice gallery with a good assortment of various forms of art. The tower in the back was once part of the original campus of the University of Rochester, one of my alma maters. When the campus moved back in the 30's the property was reconfigured as an art gallery, but is still part of the university.