Other ed.: Engl ed. The perfect medium. Photography and the occult. New Haven, London: Yale Univ. Press 2004. - Text fr. - Produced in cooperation with the following instiutions: Howard Gilman Foundation (New York); Maison européenne de la photographie (Paris); Metropolitan Museum of Art (New York); Institut für Grenzgebiete der Psychologie und Psychohygiene (Freiburg/Br.).