  Thirdly, Williams’s metaphysics is 4-dimensional. Or, more precisely, given the development of multi-dimensional string theories since his time, it takes Time to be a dimension in the same way that Space has dimensions. The first step is to insist, against Aristotle and his followers, that statements about the future, no less than those concerning the present and the past, are timelessly true or false. They need not await the event they refer to, in order to gain a truth value (“The Sea Fight Tomorrow” 1966, pp 262–288.) This encourages the further view that the facts that underpin truths about the future are (timelessly) Real. All points in time are (timelessly) Real, as are all points on any dimension of our familiar Space. Whatever account is to be given of Change, it does not consist in items gaining or losing Reality. This stance receives powerful support from physical theory. Williams embraced and argued for the conception of Time as a fourth dimension introduced by Minkowski’s ‘Block Universe’ interpretation of Einstein’s Theory of Special Relativity. A consequence of this is that the experience of the flow or passage of Time must be some sort of illusion. Williams embraced that consequence, and argued for it in a celebrated paper (‘The Myth of Passage’, 1951).