Turn your books into works of art using the Invisible Book Shelf - This is so awesome, I have so many books and I love them all, but storing them on a bookshelf doesn't show how great they are individually.
Create a unique and attractive wall display plus store your book collection with the Conceal Invisible Book Shelf. Your books will appear to be floating in mid air because this bookshelf is invisible behind a stack of books. (cool gadgets for your room)
Line: The book shelf in the room shows the use of line because the book shelf shelves are built against the wall forming a miniature tree. Our eyes are drawn to look at the book shelf tree from bottom to top and outward to the tree/bookshelf branches.