This is the least practical staircase ever. Tabbed treads to throw off eye and foot. Stripped lines all over the place, and in every plane, to toy with your depth perception. Clearly an ankle breaker.
As for the books, they must get punted all the time. And a typical stair riser is not more than 7″ high, which means nothing but smallish trade paperbacks under there.
Still, it’s totally awesome, and I want one. Park a bookinist at the top, and you’re in the catbird seat.