This photo is the Boomerang‘s answer to those paintings by Magritte, in which a light is on by a house, which makes the scene around it look dark, while the light of the sky above still looks almost day-light bright! This blog here has a couple examples. The photo below has a similar effect though it really looks altogether darker (though it was taken a few minutes earlier!):
The building with the clock tower is the wonderful Jefferson Market Branch of the New York Public Library, which was built in 1883 (though as a court house, not a library!). Read more about it here.