From Mueck’s Wikipedia bio:

Ron Mueck (born 1958) is an Australian hyperrealist sculptor working in Great Britain.

Mueck’s sculptures faithfully reproduce the minute detail of the human body, but play with scale to produce disconcertingly jarring visual images. His five metre high sculpture Boy 1999 was a feature in the Millennium Dome and later exhibited in the Venice Biennale.

That descripition doesn’t do his work justice. He creates incredibly realistic sculptures that look just like real, living people — except they’re tiny or gigantic. See some amazing images from the exhibit here (via BoingBoing).