<!doctype html public «-//w3c//dtd html 4.0 transitional//en»> http-equiv=content-type> Which entities should be accepted as part of the furniture of the world, and which not? What are “pseudo-objects,” if they are not properly objects? This collection explores the answers given to these questions by some key philosophers throughout the 20th century. It brings together essays by leading scholars on a subject of central importance to both metaphysics and the history of philosophy.