Final answer:
Jonas is astonished by the sheer number of books in the Receiver's room, the ornate nature of the room, and unfamiliar features like locks and the ability to turn off speakers.
Step-by-step explanation:
In the novel The Giver by Lois Lowry, Jonas finds it unusual that there are so many books in the Receiver's room because in his own dwelling, he only had access to three books: a dictionary, a book of rules, and the book that describes all aspects of the community.
Jonas is astonished by the sheer number of books in the Receiver's room, the ornate nature of the room, and unfamiliar features like locks and the ability to turn off speakers.
The presence of shelves filled with books is a stark contrast to the limited access to knowledge in his controlled society. Additionally, the room is slightly more ornate than what he's used to, and features like the lock on the door and the ability to turn off the speakers are not things Jonas has seen before in other buildings.