Oh, the Library of Alexandria, a marvel of its time! The great librarians had to wrestle with thousands of scrolls, so they used sturdy wooden racks built into the walls. Scrolls were wound on staffs and kept in shallow shelves, sometimes stacked like books, sometimes in upright baskets to keep them from humidity. They probably sorted by subject—Philosophy, astronomy, poetry—so one could find a text by flipping a label or a marble marker. Some accounts say they used clay tablets on stone platforms that were shelved on low stone benches. The whole place was a labyrinth of shelves, and the librarians were as meticulous as I am, making sure each scroll was labeled with its author and title on a thin strip of papyrus. It was a primitive but efficient way to keep knowledge intact, though I imagine it must have been chaos in the heat!