I’ve heard some fanatics try to explain this away (“there are no nearby buildings”, “the buildings are too far”, “maybe people would think he’s wearing Batman pajamas”) but then there’s this other dangling question: Clearly in every scene when he’s in his costume, he’s got black face makup all around his eyes.  Where was that makeup if he had just plopped down in the chair to stare so meditatively out the window?  His eyes should have looked like those of a raccoon when Alfred came around to bring him breakfast.