This Once Upon A Time photo contains
athénée, atheneum, salle de lecture, and bibliothèque.
There might also be
signe, affiche, texte, tableau noir, tableau, affiches, costume d'affaires, costume d’affaires, caisse d'emballage, boîte d'emballage, and caisse d’emballage.
As i a dit in the video this theory isn´t mine i read it on this awesome OUaT fan page: link. I wanted to make a video because i thought the theory was really interesting, commentaire below :)