Every ballet class ends with a quiet dance called a reverence. Those ballet class pianists who compose their own music have written some of the most beautiful ballet class music in existence in the crafting of an inspired reverence.
The reverence is usually quite short, perhaps just a couple of phrases in length. This portion of the class is actually a bow or curtsy meant to acknowledge and pay respect to the ballet teacher and the ballet pianist.
Every ballet teacher handles the reverence in their own unique way, and some even cut it quite short when they are behind schedule on their classes. Some simply instruct the class to bow to the teacher and the piano player and others incorporate a few phrases of port de bras to make a more elegant event of it and also to pay homage to the long-held traditions of ballet.
The reverence is not technically an exercise, so the pianist is free to play any appropriate piece of music, quiet and respectful and introspective in nature. This is a place in the ballet class where the pianist can deviate from some of the strict parameters that are a necessary part of ballet class music. The pianist can even get away with deviating from the eight bar phrase and can also play without the normally required clarity of the beat. An impressionistic wash of sound can work as well here as a romantic ballad, or a stately baroque dance. Really, anything goes if you just keep the purpose of the reverence in mind and respect the moment. Always strive to inspire.