"The study of UFOs, if taken in its entirety, produces some of the same results. An endless cataloging of cases for its own sake is little more than hobbyist pornography, but looking deeper for patterns and trends sometimes opens the door to not only a deeper appreciation for the subject, but a peek from the outside of our own current views of existence and its obvious limitations. Why can’t we agree on what causes UFO sightings, or what controls the phenomenon? A few authors have already pointed out that there is little or no evidence that UFOs are interplanetary craft piloted by aliens from other star systems. Still, the hardcore believers continue to dance to this enticing tune."