Suited volunteers in bowler hats stand in the surf holding umbrellas aloft at sunrise at Bondi Beach on June 27, 2010 in Sydney, Australia. The human installation is the latest in a series of “surreal human sculptures” by artist Andrew Baines (Photo by Brendon Thorne/Getty Images)

Shadow art is a unique form of sculptural art where the 2D shadows cast by a 3D sculpture are essential for the artistic effect.

The "Square Head" is a sculpture by the french artist Sacha Sosno, and it is also the very first giant sculpture to have been transformed in a habitable building.

A craftman poses with a bamboo miniature sculpture in Hanoi on November 25, 2020. (Photo by Nhac Nguyen/AFP Photo)

A Kurdish girl wears her relative's assault rifle and ammunition belt as she waits at the Iraqi Kurdish Shaqouli checkpoint, some 35 kilometres east of Mosul, on November 10, 2016. Since the start of the Mosul offensive the Kurds have moved their border some 10 kms closer to Iraq's second city, marking it out with a line in the sand. (Photo by Odd Andersen/AFP Photo)

Sand from Montrose Beach whips past Vincent Lagrone as he walks along the lakefront October 19, 2011 in Chicago, Illinois. A high wind warning was issued for the city as winds between 40 and 45 mph are expected to cause 20- to 25-foot waves along sections of the lakefront. (Photo by Scott Olson/Getty Images)

Visitors to Salisbury Cathedral stop to look at Sean Henry's sculpture Standing Man (2007) currently being exhibited in the Cloisters on August 2, 2011 in Salisbury, United Kingdom. The exhibition, “Conflux: A Union of the Sacred and the Anonymous”, features over 20 contemporary sculptures of dramatically different scales occupying vacant plinths and open spaces on both the inside and exterior of the iconic 13th century building. This exhibition brings to the Cathedral the biggest single group of polychrome sculpture since the Reformation and runs until the end of October. (Photo by Matt Cardy/Getty Images)

The Euro sculpture is partially reflected in a puddle on a cobblestone pavement in front of the headquarters of the European Central Bank in Frankfurt on Jan. 21. (Kai Pfaffenbach/Reuters)