Instrument claim

The third and highest altitude does something the other two never do: it turns the lens back on the people doing the looking, rather than on anything from the ancient or medieval world itself. A conjecture at this altitude tests whether today's picture of the past has been quietly shaped by modern habits -- which finds a museum chose to keep, which side of a dig got excavated first, how a database happens to be organized -- rather than by anything that actually happened long ago.

The dealer's razor asks whether a dealer's own selectiveness -- which finds get kept, catalogued, and sold -- quietly reshapes what later scholars think existed. Houses keep both sides and Genre is where you dig make a similar point about excavation: which side of a house gets dug, and which genre of object a dig happens to target, can determine what a whole culture looks like on paper. The millions shrink when the titles are counted twice goes furthest, arguing that a much-cited count of surviving titles shrinks once duplicate entries are removed from the catalogues themselves.

These conjectures are the collection's most self-aware: instead of asking what the ancient record shows, they ask how trustworthy the modern apparatus of catalogues, digs, and databases is at showing it -- a check on the instrument before it is pointed at anything else.