Sometimes you see the same book on a different shelf; the same book that you have on your own shelf back at home.

It’s been sitting there collecting dust, as its binding has become commonplace among the other books that you haven’t opened for a while. Their bindings become usual, like a painting is drawn across the face of your bookshelf, for long enough that it becomes like a barrier, dissuading you from taking any of the books off of the shelf, thus breaking the barrier.

And here is this same book, the same one that you have on your shelf at home. But here it is—the same book, on a different shelf, so there is no barrier. You take it and open it and, oh, the knowledge that you once knew. You rediscover a chapter of your life that has been closed for some time, almost as clearly as if it were yesterday.