skeuomorph

Skeuomorph or Skeuomorphism is a term used in the history of architecture, design, and archaeology. It refers to a derivative object which retains ornamental design cues to structure that was necessary in the original. Skeuomorphs may be deliberately employed to make the new look comfortably old and familiar, such as copper cladding on zinc pennies or computer printed postage with circular town name and cancellation lines. The word derives from Greek, skeuos for 'vessel' or 'tool' and morphe for 'shape'.
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