The term delusion has its origin in latin illusion. It is a concept or an image that arises from the imagination or through a deception of the senses, but that has no true reality.

DelusionLinked to the senses, an illusion is a perception distortion. One can speak of optical illusions (the most common), olfactory illusions, auditory illusions, taste illusions or tactile illusions.

The optical illusion leads to perceive reality in a distorted way through sight. This distortion can be caused by physiological issues (through excessive stimulation in the eyes or the brain) or cognitive (depending on the way we perceive the world).

Among the most significant and famous optical illusions we should highlight, for example, mirages. These occur as a result of the perception of objects that we see far away and that when reflected on a smooth surface give rise to a liquid surface that does not really exist. The clearest example of a mirage is the one that takes place in deserts where the circumstances to which the individual is subjected and the characteristics of the place cause him to see things that do not really exist.

The hologram is another important type of optical illusion. This we can say that it is the result of a photographic technique that allows the development of three-dimensional images. However, we cannot forget other illusions of this type either, such as irradiation, the grid illusion or the stereogram.

The mental illusion, also called mentalism, is, for its part, that science or art that makes the person who develops it use suggestion, mental agility or stage magic to be able to undertake mind control, psychokinesis, clairvoyance or precognition. We can also establish that it is a branch within the known as illusionism.

For the psychology, the illusion is a hope that has no foundation. In a symbolic sense, it can be said that an illusion is a mirage (something that seems real but is not): “I had the illusion of solving things with her but I realized that it is impossible”, “I thought I could win the race, although it was just an illusion”.

It should be noted that the positive meaning of illusion (“My biggest dream is to travel to Europe to meet my grandfather”) only exists in the Spanish language. In others tongues, the term is always related to that which lacks support.

It is known as illusionismFinally, to the scenic art that consists of using various means to create the illusion that something impossible happens from the logical point of view: “Last night I saw on television an illusionist who cut a girl in half”.

Many are the characters that throughout history have become a reference within illusionism. However, among all of them the Frenchman Jean Eugène Robert-Houdin acquires special relevance, who has been described as the father of modern magic. Among the tricks that he performed throughout his career and that later became generalized, the one in which a person from the public shot him and he not only did not fall wounded but appeared with the bullet between his teeth.