At the onset of the after-death experience, phenomena have no structure and no recognizable features whatsoever, but are a tremendous display, the ultimate acid trip. It’s unlike wide open space on a cloudless day: something happens within that space, called sounds, colors and lights. The sounds are, Tulku Urgyen said, like 100.000 simultaneous thunder cracks, from all directions, above, below, everywhere. The colors are all colors of the rainbow, but much more intense than we normally see in this life. The rays of light are like sharp needles or swords, piercing through everything.
It is also called: Astral sound, Dharmata Swayambhu Nada, Divine Tremoring, Eternal Sound, Inner Sound, Music of the Spheres, Primordial Sound, Sacred Sound, Shabda, Sound of Creation, Sound of Silence, also Thunder of Silence, Soundless Sound, Transcendental Sound, Unborn Sound, Unstruck Sound, and The Word of God.