The universe inhabited by the spacetime-defect fauna was quite unlike that of humans. There was no light, for instance, for the electromagnetic force which governed light's propagation had yet to decouple from the GUT superforce. But the spacetime-flaw creatures, huddled around their black holes, could 'see' by the deep glow of the gravity waves that crisscrossed the growing cosmos.
-Exultant, Ch. 39