See also: [Clone]
[Authenticity and Originality]
[Autographnic vs Allographic]
[Philip K. Dick]
[The Performed WEB (including programming)]
[Realism Now (essay by Linda Nochlin)]
A simacrulum is something that looks/acts like a certain thing.
However, un-like a clone or a duplicate of the orignal its
internal design, behaviour, appearance may vary.
Thus, in ST-TNG ("Star Trek: The Next Generation"), Commander
Data (portrayed by Brent Spiner) is a simacrulum of a human.
His behaviour (eg, he can-not or will-not use contractions of
verbs) mimics (or at least partially reproduces) that of humans.
The concept of an "ersatz" thing ??defn?? can represent both the
simarcrulum and the clone of a thing - but probably not both