A Psi wheel is a pyramid-shaped piece of paper or foil balanced on the tip of a pointed object. It is commonly used in attempts to prove the existence of psychokinesis (shortened to "psi").
The term psychokinesis means "movement from the mind". It is sometimes abbreviated to PK. The terms refer to the direct influence of the mind on a physical system that cannot be entirely accounted for any known physical energy.
There is no convincing scientific evidence that psychokinesis exists. Historically, PK experiments have been criticised for lack of repeatability and proper controls. Some experiments have created illusions of PK but these illusions depend to an extent on the subject's prior belief.
Telekinesis is still one of the main areas of research in modern parapsychology, the scientific study of paranormal experiences.
The study of telekinetic phenomena is usually sub-divided into two categories: Macro-PK and Micro-PK, depending upon the size and scale of the phenomena being tested.
Metal or spoon bending is a supposed example of macro-PK.
Attempts to influence the output of an electronic random number generator would be termed micro-PK, due to the tiny nature of the phenomena.
The idea of Psychokinesis first appeared during the 19th Century as a supposed explanation for various séance phenomena.
Two of the most famous claimants to the power of Psychokinesis are Uri Geller and the Russian psychic Nina Kulagina.
From the 1970's to the mid 1990s it is estimated that over 20 million dollars had been wasted on research into psychokinesis and remote viewing, the practice of being able to see an object hidden from view.