The collection of Agent-Intangibles (q.v.) who were formerly Persons but have since died (see dead organism), and (it is commonly believed) are bound (perhaps temporarily) to the locales where as Persons they lived and died. Despite their intangiblity (see intangible), ghosts are traditionally believed to be perceivable to humans, at least on occasion. Seeing a ghost, reportedly, can be a very frightening experience.