Quantities of facsimile copy were scrutinized. Chains rattled and clanked as the more precious books came down from their shelves. In the case of partially damaged or deteriorated originals, it seemed unwise to trust the facsimile-maker’s interpretation and eyesight. The actual manuscripts dating back to Leibowitzian times which had been sealed in airtight casks and locked in special storage vaults for indefinitely long preservation were then brought out.