But if there are many people like you, and especially if you are occupying space that might be occupied by a paying customer, the management will change the rules.
The management will be mad if you take up space that a paying customer wants.
Undaunted, Chatterbox marched off to a nearby bookstore and purchased What the Face  Basic and Applied Studies of Spontaneous Expression Using the Facial Action Coding System (FACS) , edited by Ekman and Erika Rosenberg.