Clairvoyance or "clear seeing", is the ability to see anything that is not physically present, such as objects, animals or people. This sight occurs "in the mind's eye". Some mediums say that this is their normal vision state. Others say that they must train their minds with such practices as meditation in order to achieve this ability, and that assistance from spiritual helpers is often necessary. Some clairvoyant mediums can see a spirit as though the spirit has a physical body. They see the bodily form as if it were physically present. Other mediums see the spirit in their mind's eye, or it appears as a movie or a television programme or a still picture like a photograph in their mind.
In 1936, the psychical researcher Nandor Fodor tested the Hungarian apport medium Lajos Pap in London and during the séance a dead snake appeared. Pap was searched and was found to be wearing a device under his robe, where he had hidden the snake.[157] A photograph taken at a séance in 1937 in London shows the medium Colin Evans "levitating" in mid air. He claimed that spirits had lifted him. Evans was later discovered to be a fraud as a cord leading from a device in his hand has indicated that it was himself who triggered the flash-photograph and that all he had done was jump from his chair into the air and pretend he had levitated.[158]
^ Brian Righi. (2008). Ghosts, Apparitions and Poltergeists: An Exploration of the Supernatural through History. Llewellyn Publications. Llewellyn Publications. p. 52. ISBN 978-0-7387-1363-2 "One medium of the 1920s, Mina Crandon, became famous for producing ectoplasm during her sittings. At the height of the séance, she was even able to produce a tiny ectoplasmic hand from her navel, which waved about in the darkness. Her career ended when Harvard biologists were able to examine the tiny hand and found it to be nothing more than a carved piece of animal liver."
In 1891 at a public séance with twenty sitters the medium Cecil Husk was caught leaning over a table pretending to be a spirit by covering his face with phosphor material.[87] The magician Will Goldston also exposed the fraud mediumship of Husk. In a séance Goldston attended a pale face materialization appeared in the room. Goldston wrote "I saw at once that it was a gauze mask, and that the moustache attached to it was loose at one side through lack of gum. I pulled at the mask. It came away, revealing the face of Husk."[88] The British materialization medium Annie Fairlamb Mellon was exposed as a fraud on October 12, 1894. During the séance a sitter seized the materialized spirit, and found it to be the Mellon on her knees with white muslin on her head and shoulders.[89] 

According to the magician John Booth the stage mentalist David Devant managed to fool a number of people into believing he had genuine psychic ability who did not realize that his feats were magic tricks. At St. George's Hall, London he performed a fake "clairvoyant" act where he would read a message sealed inside an envelope. The spiritualist Oliver Lodge who was present in the audience was duped by the trick and claimed that Devant had used psychic powers. In 1936 Devant in his book Secrets of My Magic revealed the trick method he had used.[159]
To up the difficulty for me and to make it easier for the psychics (it's one thing to lie over an email or call, but another to lie to someone's face), I decided to see my next psychics in person—who knows, maybe getting readings via email didn't provide a strong enough spiritual connection or clues to see I was lying. I also looked for people who charged for readings (maybe you get what you pay for?) and settled on one for $20 and another for $40. Both told me to bring a photo so I pulled one off a (very much alive) friend's Facebook and, armed with Emily's backstory and a few years of high school acting/improv experience, headed out for my third reading of the day. At the point, I was almost hoping to be called out soon—it was too easy.
Many 19th century mediums were discovered to be engaged in fraud.[61] While advocates of mediumship claim that their experiences are genuine, the Encyclopædia Britannica article on spiritualism notes in reference to a case in the 19th century that " by one, the Spiritualist mediums were discovered to be engaged in fraud, sometimes employing the techniques of stage magicians in their attempts to convince people of their clairvoyant powers." The article also notes that "the exposure of widespread fraud within the spiritualist movement severely damaged its reputation and pushed it to the fringes of society in the United States."[62]