A bookshelf made from Cuihua Wood, above which many miscellaneous items can be mounted.
The Knights had such shelves made to make the retrieval of books by researchers more convenient. The original intention was to only put some special collections in, but the store of books was so great that all manner of book collections were included in the end.
Such a free-form display of tomes is, well, somewhat fitting of Mondstadt’s character.
Where to Get Two-Tier Library Bookshelf Furnishing?
Blueprint of this furnishing can be obtained from Adeptal Mirror Round 4, and can be crafted with these following materials: