 This example illustrates why it is crucial to keep two questions distinct: on the one hand, is motion to be understood in terms of relations between bodies or by invoking something additional, something absolute; on the other hand, are all relative motions equally significant, or is there some ‘true’, privileged notion of motion? Descartes’ views show that eschewing absolute motion is logically compatible with accepting true motion; which is of course not to say that his definitions of motion are themselves tenable.