I designed some raising stairs, a platform and a bookcase to make use of the dead space above the existing stairs in my flat. The stairs raise up when the ‘Library’ isn’t in use with the help of a pump like you get in an office chair.
Attic Bedroom Closet Design, Pictures, Remodel, Decor and Ideas - page 9 - sublime-decor. I have the perfect wall (with attic behind it) to do this. I've often thought of making an easily accessible closet there.