Mark's camping out in the ballroom today, slouched in a folding chair with a book in his lap. On one of the floor-length mirrors, he's written the following message:

?ereht enoyna sI

.klat ot ekil d'I

From time to time he looks up, checking for a response. If he's going to sound mirrors out for cahoots, he wants to do it in person. (More or less.)