Hidden interior doors behind the bookcase
It would seem that it is already difficult to come up with something new andunusual in the construction of doors! But, as is known, the new is a well-forgotten old. Think of secret passages and rooms in medieval castles. In the modern interior, hidden interior doors will also be in place. It's hard to guess that in reality a niche in the wall with bookshelves represents a hidden door to the next room! 
The idea of a bookcase that is bothdoor, practical and original. Thus, you can mask the entrance to your "secret" shelter, for example, a cabinet, office or a room for storing personal belongings with a safe. Now many people want to have such secret places in their house. This design will allow to solve this problem even without re-planning of the dwelling. The only inconvenience that can be encountered is that when you open the door, books and other items can fall off the open shelves. Therefore, it is desirable to close the shelves with glass or use side-holders. 
Such hidden interior doors in the form of a bookcabinet with built-in shelves perfectly save space in the room. Next to the door is a good place to place a cozy area for relaxation, with a sofa, coffee table and lamp. It may seem that the door is very massive and it will be difficult to open it. This is not so, the design is designed in such a way that the door succumbs to a slight push. Of course, not every ordinary interior door can be replaced by such a construction because of its width. But this is an excellent option for country houses! 
