This collection of short stories takes its name from various islands historically believed to exist and at one time or other located on maps, sometimes remaining on them for centuries, but later removed after they were proved to be illusory. Reports of these islands usually came from sailors as they explored new realms, mistaking actual islands for imaginary ones or by geographical error. Illusions can persist unchallenged for ages. A similar yet modern illusion is the persistence of vision, a phenomenon by which an afterimage, say, on a screen, is thought to persist on the retina for approximately one twenty-fifth of a second. The characters in these stories live their isolated lives as after-image phantoms on islands that either never existed or no longer exist.