Light bookshelf made of solid oak

As a rule, bookshelves have a rather bulky design and look very massive on the wall.
The model of this bookshelf was developed with one prerequisite - the shelf should look light, floating, weightless.
Books are produced in different formats, when ordering, specify for what size of books you need a shelf. The bookshelf in the photo is made for books with a size of 215*170mm.
The shelf has hidden fasteners.
The price is for one solid oak shelf in the size - 540*270*140* mm.
Optionally can be made in other sizes, colors. From possible materials - beech, oak, ash.