H. G. Wells, “Invisible Man”, 1897 was a science-fiction novel about human “invisibility”. Invisibility is the state by which the object can not be seen. Cloak and the wearer of clothing appears as only garments. H. G. Wells is giving an exposition on “relativity”. Relativity is a phenomena of seeing of motion by an observer of the observed objects. Invisibility here by H. G. Wells is “physical”, and not supernatural ghost. Oliver Sacks, “The Island of the Colorblind”, 1997 is a nonfiction science book on “physiologic” invisibility.