Wikipedia
METALmorphosis
METALmorphosis is a large (7 metre, 13 tonne) kinetic sculpture of a human head, by Czech artist David Cerný.
The sculpture is in the Technology Plaza in Charlotte, North Carolina, where it sits in a large reflecting pool.
The piece is executed in polished stainless steel. The sculpture spouts water from it's mouth, and is made of some 40 layers which can rotate individually.
A later and larger work, K or Hlava Franze Kafky, weighing in at 45 tonnes of steel, the head that of Franz Kafka, is in Prague.