Source: But it looks so real! The parallel rise of photography and Spiritualism
In 1862, amateur photographer William H. Mumler of Boston took a self-portrait in his studio, unaware of a ghostly apparition lurking directly behind him. It wasn’t until he viewed the resulting image…
Hablot Knight Browne, The London Stereoscopic Company; The Ghost in the stereoscope; 1856 – 1859. Image and original data provided by Rijksmuseum: https://www.rijksmuseum.nl