For five bookcases, I moved all of the books on all of the shelves, shifting upper to lower, lower to upper, discarding or adding, and reordering each one, just so that those books would become visible to me once again.
Have you ever noticed how after a while you don't even see the pictures or the art you have hanging on the walls where you spend your time each day, home or office?
Same concept.
Next, maybe, I'll move the pictures and art around.