artefact

/ ˈɑːtɪˌfækt /

noun

something made or given shape by man, such as a tool or a work of art, esp an object of archaeological interest
anything man-made, such as a spurious experimental result
cytology a structure seen in tissue after death, fixation, staining, etc, that is not normally present in the living tissue

C19: from Latin phrase arte factum, from ars skill + facere to make

Hence it is extremely difficult to distinguish what is preformed, and what is artefact.

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