The antiXeelee cradled him. It studied him dispassionately, huge and cold. Paul felt knowledge wash over him, and slowly understanding grew.
The cube planet had been created at that moment — far in the future of mankind — when the Xeelee reached their full glory. And were ready to depart.
(Depart? Where to? Why? The answers were — awesome; beyond his comprehension.)
On its completion the cube — with its guardian, the antiXeelee, and with a million others — had been sent on an impossible voyage, forging back through the unfolding ages to the birth time of the Xeelee themselves. The Xeelee would erupt fully developed from the cubes, shaking out the wings of their beautiful spacecraft and ready for their huge projects. Paul sought human words to capture the vast concepts sailing around him. Vacuum diagrams! The cube worlds were antiparticles, moving back through time to initiate their own creation. The whole of Xeelee history was a single, vast vacuum diagram, closed and complete of itself.
-Vacuum Diagrams, "Vacuum Diagrams"