If you grew up in a rural area, you have seen how farmhouses come and go, but the dent left by cellars is permanent. There is something unbreakable in that hand-dug foundational gouge into the earth. Books are the cellars of civilization: when cultures crumble away, their books remain out of sheer stupid solidity.
The title of the work, its place in the collective library, the nature of the person who tells us about it, the atmosphere established in the written or spoken exhange, among many other instances, offer alternatives to the book itself that allow us to talk about ourselves without dwelling upon the work too closely.