Levitate Architects used a staircase to a loft-like bedroom to create an enormous amount of book storage space. Even though the staircase isn’t very compact but could accomodate so many books that it would save some space anyway.
A Library Slide by Moon Hoon slides libraries books architecture - Stairs, Library, Slide - Also the Wall facing the stairs has a big screen TV / Projector so people can sit on the stairs and watch movies / TV as well.
Thierry W. Despont said of the library he created in a Georgian Revival house, also of his making, in Toronto, Canada. The library’s baronial design, a riff on the domed hall of Palladio’s Villa Capra.