The Aubade is a morning poetry set before or around dawn. A competent poet will include the look of light into their picture without expressing it overtly. The purpose of this art is to awaken desire in a woman's heart, but not to force her to respond. If she does, then that's fine too - the poet is skilled at his craft. Aubades were often attached to doors in medieval times as a way of getting attention from women inside homes. The poems themselves could be romantic or satirical - these things depend on who the poet is writing it for. Usually they're written in iambic pentameter (a type of poetic metre) but other meters are used as well. People usually attach pictures to their bedroom doors during Christmas because it's thought to bring good luck. This isn't true in all countries, but it is in England. Having a picture on your door makes people feel welcome when they come into your home, which is important since most people go straight to their bedrooms after waking up.