With these words, the Swiss psychologist Carl Jung described the various theories about the mysterious objects in the sky as early as 1958. Are they spaceships with extraterrestrial astronauts, beings from the upper atmosphere, experimental aircraft, or mere natural phenomena? This book tells the story of the UFO phenomenon from ancient times to the present day. The 100 incidents described range from crop circle makers to UFO sightings around the globe, close encounters with tiny or gigantic beings, to dramatic abductions by aliens and cover-ups by government agencies. The author John Michael Greer takes the reader on an exciting, sometimes amusing tour through the world of unexplained, extraordinary events in the sky or on Earth.