WHAT CAN I DO IN THE LIBRARY?

You mean besides admire the extensive book collection and talk to the parrot?

Do you see a mysterious keypad by the blank wall?

There must be a clue to it somewhere in this room.

Why don't you admire some of the art?

There's an interesting pattern on the antique vase.

It almost looks like the keypad.

Tap the corresponding keys on the keypad in the order indicated by the arrow on the vase.

These are: bottom middle, bottom left, upper right, upper left.