Summa Theologiae, the notion of Book-as-Monument. Missing a piece of the works feels equivalent to owning a large painting with a missing area. These derive their splendor from their comprehensiveness.Books as monument (though not Summas): Bayle's Dictionaire (16 vol!),Proust's Recherche, Gibbon's D&F, Zola's Rougon Macquart, Martin Du Gard's Les Thibault, Anthony Something Dance to the Music of Time…