Helland notes that the Ashtar belief system is based on faith in an extraterrestrial celebrity, the concept of which has fared better than the individual messages. The main shifts in content seem due to failed prophecy, which has moved the emphasis from a physical space fleet averting doom, to the more theosophical concept of an Ascended Master aiding spiritual advancement. He maintains that the Ashtar beliefs are best seen as a syncretism between the I AM movements and the UFO experience, a belief system which regards UFO experiences and sightings as the natural progression of the spiritual development of humanity. Though followers of Ashtar believe in his divine right and knowledge spread across the human race, he and others of his kind have yet to provide any physical evidence of their existence. <ref>Helland, Christopher (2003)