There exists an entire world around us that cannot be seen. It is said that the human eye sees only about 2.5% of the electromagnetic spectrum, so over the years many people have questioned what is hidden from us. One of these people was Trevor James Constable, a pioneer who first began his work in the Californian desert in the 1950s, photographing what he considered to be UFO-type objects and strange biological life-forms traversing the skies in the infrared part of the spectrum. Although many of the invisible UFOs he photographed were disc or saucer-like in appearance, Constable discovered that these were in fact living beings, as opposed to being of a mechanical nature, and he held that when these objects became visible they were mutually confused with spacecraft. A quarter of a century later, teams of engineers and technicians from both Italy and Romania, who unaware of Constable's 1958 discoveries, obtained virtually identical infrared photographs of invisible UFOs and other aerial phenomena that were published in Italy in 1980. Despite this, the so called "UFO experts" have consistently failed to recognise the importance of these findings, preferring instead to perpetuate the myth that all UFO manifestations must be interplanetary spaceships and nothing else, a myth which has sadly become the mainstay of modern-day ufology.