Time organizes things in a dynamic fashion, whereas space organizes things in a static fashion-so things in time undergo passage, whereas things in space do not. What makes the temporal organization of things dynamic? What is the nature of the passage of time? Traditional discussions of passage have taken one of two perspectives. Some philosophers start with passage as a phenomenon that occurs in the physical world. They ask what constitutes this objective phenomenon. Theirs is a project i...

This Element is a survey of central topics in the metaphysics of material objects. The topics are grouped into four problem spaces. The first concerns how an object's parts are related to the object's existence and to the object's nature, or essence. The second concerns how an object persists through time, how an object is located in spacetime, and how an object changes. The third concerns paradoxes about objects, including paradoxes of coincidence, paradoxes of fission, and the problem of...