The library has been replaced with some sort of shrine.
But it's not the only one affected.
Unsafe until further notice.

One, Two, Three, return to me now.

How noisy. I know you are all hallucinating, but really, so troublesome. Follow the images you see to the end if you must. I certainly won't stop you...

I jest.

[...Except his voice is as calm and blank as ever. It's rather hard to tell whether he's joking or not.]

There's an unusual "feeling" in the air.

...We might be busy later. Don't wander off now.