Photo of a group at a seance, c 1920 by William Hope, “spirit photographer”
The information accompanying the spirit album states that the table is levitating - in reality the image of a ghostly arm has been superimposed over the table.
Hope’s “Spirit Photography” work gained momentum after WWI, when many people were desperate to find evidence of loved ones living beyond the grave. His techniques used double and triple exposures to render the appearance of ghostly apparitions around the sitter. His deception was publicly exposed by a private investigator in 1922, but he still continued his work. (via the UK’s National Media Museum)