An icebreaker
A writer began receiving messages through a Ouija board in 1963 from an entity she called Seth, then dictated his teachings aloud for twenty-one years. As she held it, Seth spoke through her; skeptics see no need for a supernatural source.
Beginning in late 1963 and continuing for twenty-one years, she held regular trance sessions dictating material she attributed to a personality named Seth, maintaining throughout that Seth was a distinct voice speaking through her rather than a character of her own invention.
He recorded and later organized the thousands of pages produced across the sessions, publishing much of the raw transcript material himself after her death in 1984 alongside the edited Seth books.
Assessing the Seth material, he wrote that there was time and talent for fraud or for unconscious production, that the two could not be distinguished, and that there seemed little need to invoke any supernatural agency.