 Leibniz held a relational theory of space and time. Without things there would be no space, and without events there would be no time. Space and time are not containers into which things and events may be inserted but which could have remained empty. In the Third Letter to Clarke (G 7:364), Leibniz maintains that “without the things placed in it, one point of space does not absolutely differ in any respect whatsoever from another point of space.” An even more ambitious positive proposal makes space the “order of co-existents” and time the “order of successions” (G 7: 363), or a “well-founded phenomenon.”