Looking through

Every day at 10:30 am he leaves his office and walks up the flight of stairs that take him to the cafeteria where he orders a croissant and a glass of orange juice. He is always served by the same efficient bartender. This routine has been going on for so long that the bartender never asks him about his order anymore. A croissant plus a glass of orange juice is the immutable choice, day after day after day after day. Only today, for some reason, the bartender looks at him and points to his customer's beardless face with a frank sign of surprise, a face that remains hairless for half a year already. He sighs a silent sigh, somewhat longer than your ordinary sigh. Walking down the flight of stairs some minutes later he ponders about concepts he is acquainted with.