In defense of the contingently nonconcrete

objects are fundamentally di#erent in kind from objectsthat are concrete at some world or other. Among other things, theyencode as well as exemplify properties, and in particular, they can encodeincomplete (and even inconsistent) groups of properties. The propertiesthey encode are the ones by which they are uniquely identified. Eachdi#erent group of properties determines a di#erent abstract object. Thismakes abstract objects suitable as intentional objects; every conception,however...