In which we are gently guided from the realm of ordinary dreams to the curious phenomenon of waking hallucinations experienced by sane and sensible folk, with thoughtful reflections on the revelations of Mr. Galton and the intriguing practice of crystal gazing. We are also invited to ponder marvellous accounts of visions that verged on the prophetic, including an historical narrative offered by the Duc de Saint Simon, all quietly challenging the boundaries of science and belief.