The Journey of light is often described as an element of a near-death experience. People describe the experience as floating upwards peacefully through a long journey of the intense darkness of the tunnel and its very narrow entrance. One can barely squeeze through it. At the end of this journey is a beautiful demulcent light to be found. It remains to be determined whether this phenomenon is universal or not, and whether it is purely subjective or purely objective or the result of a physiological phenomenon. The journey of light is a well known leitmotif in film and television. As a plot device it is most commonly described as a passageway to heaven or "the other side" for dead or ghostly characters, while living characters urging ghostly characters to "cross over" or "go towards the light". Usually it is the passage through this 110 meters that distinguishes the ghosts from the angels.