Part I Esalen, California, 1991. Not found in a book. Exploring the crop circle phenomenon. The Plasma Vortex theory. Why are crop circles associated with megalithic sites? The evolution of their patterns and features. A look at some of the diverse theories: from migrating hedgehogs to the celestial theory. Is there a single satisfying explanation? Is the hoax theory an unlikely explanation? Terence's theory that crop circles are an intelligence operation and an experiment in deception.

Part 2 (39:52): Esalen, California, 1991. Not found in a book. Further investigations into the crop circle mystery. Are crop circles a method of Gaian communication? An international crop circle competition. Crop circles should be empirically investigated. Terence explains his 'trap theory' - Are they a disinformation project aimed at preserving orthodoxy? Reactions to Terence's theory. Christian and pagan ideologies and the impact of Christianity on paganism. Christian animism. Appreciating sacred places. Rupert's plan for a research project on crop circles.