Cities are more profound at night. Pictures of cities lit at night make them seem much more important places than those same cities in the light of day.
At night, colors are muted, it is not quite black and white, but the garishness is avoided. Perhaps this is why I prefer London to New York, Black Cabs are just cooler than Yellow Taxis.
See e.g. this video of New York by James Ogle (via Infrastructurist)