Your bookshelf might not seem interesting at first glance, but it has a strange history that might surprise you.
Ever since books began phasing out scrolls in the 1st century AD, they've needed a place to rest.
During the first 1,400 years of the book's existence, people managed to arrange them in just about every conceivable way other than today's current format.
They've been packed away in large trunks. On shelves, they've been piled horizontally or with the spines up, down, or backwards.