Modern physics questions the absoluteness of time. Yet the cosmological theories of Mach, Einstein, and Barbour are no more testable, given the scale of the universe, than those of the first theoretical physicist, Parmenides, who was also a poet. He described how change cannot logically exist yet it observably exists. This kind of paradox is the stuff of poetry. Since the arrival of quantum physics it is the stuff of physics too. Perhaps physics can only advance, and poetry can only maintain what Thomas Hardy called its sustaining power if each is open to the thinking of the other. This book explores the findings of neuroscience as well as the experience of poets and physicists when faced with the paradox of Time / No Time.