 The first chapter of Space, Time, and Deity opens with Alexander’s proclamation that all the vital problems of philosophy depend on space and time (Alexander 1920i: 35). Alexander conceives space and time as the stuff out of which all things are made: space and time are real and concrete, and out of them emerge matter, life, and so on. Space and time are unified in a four-dimensional manifold, spacetime. This single vast entity does not move but contains all motions within itself, and so Alexander labels it “Motion”. In this respect, Alexander’s spacetime bears some resemblance to F. H. Bradley’s (1893) Absolute: neither Motion nor the Absolute move or exist in time, but they both contain motion and time within themselves.