This is intended as a hidden doorway, but it's a reasonable way to design closet doors. That's because you're not expecting furniture to be placed in front a closet door. So, adding shelving makes use of that otherwise dead space.
50 home library design ideas. This design is actually very easy to do. Use a room in your home that has a bedroom just off of it and install (or build) bookshelves on the wall were the bathroom door is. Change out the bathroom door for a bookshelf.