A bookshelf should be an ordered thing, full of books which might be jumbled but all with their spines facing outwards, and on a shelf that you can reach.
An assortment; this one speaks of that member of the family, that one of another. I have read the books on the bottom shelf to each in turn, the pages retaining the faintest reminder of a sticky finger, tiny hands. On the bottom shelf anyone can reach them, take them, spend a while sitting on the floor. Did it drag you in so rapidly that there was no time to find a comfy chair? This piece of floor will do just fine, a shaft of sunlight, the rose tapping its stems against the window, trying to join you in that other world.
Each of us works our way up the bookshelf, one rung at a time. But don’t worry, the book shelf has no ceiling. You can go on forever.