the use of real life objects on a computer or the internet (web) to represent the real life counterpart (biorealism). using a realistic icon, symbol or image as a placeholder for a real life object on a computer or the internet rather than a word.
the use of an envelope icon to represent the action of writing and mailing a text message or email is a natural user interface.
the use of a head shot (as on friskyhands.com) rather than a simple boarder less picture is a natural user interface.
the use of an index card (as on positivelyfrisky.com) rather than a plain white box is a natural user interface.
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