Shape Shifting

Shapeshifting is a common theme in mythology and folklore as well as in science fiction and fantasy. In its broadest sense, it is when a being has the ability to alter its physical appearance. The transformation may be purposeful or not, depending on whether it has been the subject of a curse or spell. In some folklore, once the shapeshifter has become transformed, it becomes progressively more difficult for it to return to its original form.


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Wikipedia

http://en.wikipedia.org/wiki/Hard_science_fiction

License

http://creativecommons.org/licenses/by-sa/3.0