Secret Door
I finish a lot of attics. And customers always wonder what to do with the "wasted" space behind the knee walls. I often build in shelving, chests of drawers or storage areas. This customer wanted to combine the built in shelving, with a secret door to a storage area. Forgive the camera phone photos and the fact that the trim and drywall are unpainted, here's a bookshelf that slides open to become a secret door to storage area.