Hello--
 "Wish I could remember the name of the artist who does life-size sculptures
of people...the guard, the tourists on the park bench...you've all seen
them...they're quite life-like."
        I believe that you're thinking of J. Stewart Johnson.  His sculptures
are indeed life-like and often rather creepy in their obsessive
descriptiveness.  I bet one of them could scare people away quite
effectively...
        Adrienne DeAngelis
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