Developed from a memorable series of lectures delivered in San Francisco, which included a legendary symposium at the Palace of Fine Arts with astronaut Rusty Schweickart, Joseph Campbell’s last book explores the space age. Campbell posits that the newly discovered laws of outer space are actually at work within human beings as well and that a new mythology is implicit in this realization. He examines the new mythology and other questions in these essays which he described as "a broadly shared spiritual adventure."