The Mystic Eyes of Death Perception can be called a circuit that opens up in the brain and eyes to allow the user to "perceive death," the conceptual "Death of an Existence," as visual signals in the form of Lines of Death (死の線, Shi no Sen?) and Points of Death (死の点, Shi no Ten?). Although Shiki Ryougi only sees the Lines of Death, certain Lines act as the Points of Death that Shiki Tohno would see. Their usage is not entirely dependent on the eyes of the user, as they can still "see" lines should they go blind or gouge them out. Rather than "seeing," it is more like they are "observing" everything at a higher level. "Death" is invisible to normal people, only accessed through perceiving the natural flaws with overly strong spiritual sight by looking through channels that normal people can