The spiritualist movement rose at about the same time photography was invented. Therefore, it was no wonder that the earliest use of trick photography was to show evidence of spirits that one could communicate with -for a small fee. Buzzfeed has a collection of quite a few of these "spirit" pictures. Link
Treasure Hunt - Win a Tokyoflash Watch of Your Choice!
Going on right now: Tokyoflash Treasure Hunt #27. Win a Tokyoflash watch and neat stuff from the NeatoShop. It's fun and easy to play!