The causal outcomes obey the usual well-respected rule that the causes precede the effects in time. Some pairs of processes cannot be connected by cause-and-effect relations, and they are said to be spatially separated. This is in perfect agreement with the viewpoint of the Einstein theory of special relativity and with the Minkowski geometry of spacetime. It is clear that Whitehead respected these ideas, as may be seen for example in his 1919 book "An Enquiry concerning the Principles of Natural Knowledge" as well as in "Process and Reality". Time in this view is relative to an inertial reference frame, different reference frames defining different versions of time.