[Korostelevm] did an amazing job of hiding a small closet with a bookcase-door. It’s something straight ... part of the build is figuring out how to hinge all the weight a bookcase will carry.

“Furthermore, it can be hinged on the left or right and can accommodate doors from 2’6” to 3’6” in width.” It took Hidden Doors by Design two years to develop the 180-degree hidden door hinge system .