|Bookcase Staircase from Apartment Therapy: Europe|
Or, it's could refer to this awesome staircase, designed by Levitate Architecture and Design Studio in London. A bookcase that is also a staircase, complete with skylight above to light your ascent. It reminds me of Alice falling down the rabbit hole. I can see myself curled up here for hours, reading, browsing, and getting in everybody's way. Like a cat.
Go ahead and feed your imagination. See more pictures at Apartment Therapy: Europe's website.