In the figures and mythology of Los and Enitharmon, "William Blake carries his attack upon eighteenth-century philosophy to the most fundamental issue of all, the nature of time, space, and material bodies. Proclus' commentaries on Euclid, one of Samuel Taylor's earliest publications, contain a most subtle discussion of the mental nature of space. It is even likely that Blake first became familiar with the notion of the mental nature of space and place through Proclus and through Taylor's own brilliant essay On the Restoration of the Platonic Theology. Time and Space are born together; they are the twin children of Enion, who is matter: His head beam'd light & in his vigorous voice was prophecy. Blake's grasp of the idea of space and time and all appearances as creations of mind itself finds its most splendid expression in a long passage in Milton, pages 28-29.