I talked with a woman the other day whose mom collected miniature books. I jokingly told her that everyone who collected miniature books was a little crazy, and she proceeded to tell me this story.
When her mom did the whole retire/downsize thing, she moved from her house into an RV. Along the top edge of the walls of the RV, she built a little 3″ high shelf, and then covered it with moulding. So, she could put her miniature books on the shelf and with the moulding on, it just looked like fancy trim work. But, as she drove around to book shows, fellow collectors, or dealers and invited them in, she could pop off the moulding and voila! there is her collection of 900 miniature books!!