Before photoshop, there was the disturbing art of spirit photography.

Ever since technology has allowed people to capture pictures, photographers have been using photo-editing techniques to trick people. One of the most fascinating early examples is spirit photography. Customers believed that the spirits of lost loved ones were communicating with them through these photographs. The first spirit photographer was William Mumler, who discovered a double exposure technique in the 1860s that made ghostlike figures appear in photographs. He would take pictures of people and then alter the negatives using other pictures to make “spirits” appear with the living subjects.
Read more: http://www.messynessychic.com/2016/12/21/before-photoshop-there-was-the-disturbing-art-of-spirit-photography/?source=Snapzu