Showing Ghosts Everywhere, and of Any Colour Brown, J. H. creator text utu 2020 monographic en 1 online resource : multiple file formats "Spectropia; or, Surprising Spectral Illusions" by J. H. Brown is an optical illusion book published in 1864. Disturbed by growing public belief in spiritualism, Brown created this illustrated work to offer scientific explanations for ghostly apparitions. The book features hand-colored plates that, when stared at and then looked away from, create spectral images floating on walls through the phenomenon of afterimage. Brown hoped to extinguish superstitious beliefs by showing how our senses can deceive us. (This is an automatically generated summary.) Wikipedia page about this book: https://en.wikipedia.org/wiki/Spectropia Release date is 2020-11-22 Tim Lindell, Chuck Greif and the Online Distributed Proofreading Team at https://www.pgdp.net (This file was produced from images generously made available by The Internet Archive/American Libraries.) Original publication data not identified Ghosts Optical illusions GV Original publication data not identified 13004459 https://www.gutenberg.org/ebooks/63842 https://www.gutenberg.org/ebooks/63842 UtSlPG 260607 20260610134453.0 63842