I’ve outgrew my allotted space last year at ~125 ft^2 of shelfing. This year I have custom made a set of rolling shelfs that provide an additional 25 ft^2 of shelfing while opening up 6 ft of wall space. Wife’s happy, I’m happy, kids are still ‘stealing’ my books so I guess they’re happy too.
That must be so neat. I've got this "dream" library in my head that I am going to build someday. Floor to ceiling bookshelves, in a two story room, and rolling ladders to get me where I want to go. A really comfy reading chair, table to set my drink (etc) on, a loungy area for the four legged critters and a sound system.
Yep, that is my idea of a happy place. :-)