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The preternatural or praeternatural is that which appears outside or beside (Latin præter) the natural. In contrast to the supernatural, preternatural phenomena are presumed to have natural explanations that are unknown. It is "suspended between the mundane and the miraculous".
In theology, the term is often used to distinguish marvels or deceptive trickery, often attributed to witchcraft or demons, from the purely divine power of the genuinely supernatural to violate the laws of nature. In the early modern period the term was used by scientists to refer to abnormalities and strange phenomena of various kinds that seemed to depart from the norms of nature.
Medieval theologians made a clear distinction between the natural, the preternatural and the supernatural. Thomas Aquinas argued that the supernatural consists in “God’s unmediated actions”; the natural is “what happens always or most of the time”; and the preternatural is “what happens rarely, but nonetheless by the agency of created beings...Marvels belong, properly speaking, to the realm of the preternatural.” Theologians, following Aquinas, argued that only God had the power to disregard the laws of nature that he has created, but that demons could manipulate the laws of nature by a form of trickery, to deceive the unwary into believing they had experienced real miracles. According to historian Lorraine Daston,
Although demons, astral intelligences, and other spirits might manipulate natural causes with superhuman dexterity and thereby work marvels, as mere creatures they could never transcend from the preternatural to the supernatural and work genuine miracles.
By the 16th century the term "Preternatural" was increasingly used to refer to demonic activity comparable to the use of magic by human adepts: The Devil, "being a natural Magician … may perform many acts in ways above our knowledge, though not transcending our natural power." According to the philosophy of the time, preternatural phenomena were not contrary to divine law, but used hidden, or occult powers that violated the normal pattern of natural phenomena.
With the emergence of early modern science, the concept of the preternatural increasingly came to be used to refer to strange or abnormal phenomena that seemed to violate the normal working of nature, but which were not associated with magic and witchcraft. This was a development of the idea that preternatural phenomena were fake miracles. As Daston puts it, "To simplify the historical sequence somewhat: first, preternatural phenomena were demonized and thereby incidentally naturalized; then the demons were deleted, leaving only the natural causes." The use of the term was especially common in medicine, for example in John Brown's A Compleat Treatise of Preternatural Tumours (1678), or William Smellie's A Collection of Preternatural Cases and Observations in Midwifery (1754).
In the 19th century the term was appropriated in anthropology to refer to folk beliefs about fairies, trolls and other such creatures which were not thought of as demonic, but which were perceived to affect the natural world in unpredictable ways. According to Thorstein Veblen, such prerernatural agents were often thought of as forces somewhere between supernatural beings and material processes. "The preternatural agency is not necessarily conceived to be a personal agent in the full sense, but it is an agency which partakes of the attributes of personality to the extent of somewhat arbitrarily influencing the outcome of any enterprise, and especially of any contest." 
The linguistic association between individual agents and unexplained or unfortunate circumstances remains. Many people attribute occurrences that are known to be material processes, such as "gremlins in the engine", "ghost in the machine", or giving titles to object, "Mr Sun". The anthropomorphism in our daily life is a combination of the above cultural stems, as well as the manifestation of our pattern-projecting minds.
In 2011, Penn State Press began publishing a learned journal entitled Preternature: Critical and Historical Studies on the Preternatural. Edited by Kirsten Uszkalo and Richard Raiswell, the journal is dedicated to publishing articles, reviews and short editions of original texts that deal with conceptions and perceptions of the preternatural in any culture and in any historical period.
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