The ancients used to gaze into a pool of water or, like Nostradamues, gazed into a large bowl of water-no mention of ancient spells to go with it.

https://www.youtube.com/watch?v=zKd8FK5ytVU

In the first half, paranormal investigator Joshua P. Warren talked about his new Ghost Psycho app which recreates the psychomanteum experience. He detailed how the psychomanteum was derived from an ancient Greek practice of entering an underground chamber and looking into the reflective surface of a pool of water until a "fully, corporeal" apparition appeared. In modern times, the process evolved into the use of a mirror, leading to Warren's Ghost Psycho app, which utilizes a mirrored phone screen and special white noise tone. According to reviews of the app, he said, users have already reported seeing "strange, dark things that are moving around the room" including "full bodied apparitions."

Since the Ghost Psycho app seems to induce the same effects as the elaborate methods used by the ancient Greeks, Warren marveled that "this tells us an enormous amount about why people see ghosts in general." To that end, he explained that the results indicate that seeing a ghost is far more dependent on "manipulation of the brain and the mind" rather than external circumstances, such as venturing into a 'haunted' house. "When you are gazing at this, your brain and your senses shift to become open to all these things that are around you," he said. As technology and the mind become further integrated in the future, Warren suggested, devices may become developed where people can readily perceive the supernatural forces existing around them.