A bookshelf filled with past experiences.
Lol, it's also the sign of an active mind... at least that's what I've been told
Truth. I also have quite a bit of leftover books from childhood on that shelf, which I hold dear to my heart (though I very rarely read them these days.)
Books are awesome, I still have some from when I was in middle school. I know them by heart, I don't think I could part with them