Well, they might as well be props. Some companies will sell you something that looks like book, but isn't, just to make your office look good. I have even seen a wallpaper with image of a bookshelf :)

Those look like encyclopedias to me.

top right looks like an encyclopedia set, honestly I don't think it matters much... this looks like standard CEO office "things no one ever touches"

forget the books, the scientology logo carved into the bookshelf is what caught my eye.

was it still April 1 when this was posted?

The linked tweet is really a picture of an L. Ron Hubbard office.

[dead]