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Famed Chinese artist Ai Weiwei had planned to attend the event, but he's been detained in China.

The display called "Circle of Animals/Zodiac Heads" is his first major public installation.

The 12 bronze heads represent the animals of the Chinese zodiac.

The sculptures, which weigh-in around 800 pounds each, are re-imaginings of works that were looted from a Chinese palace by the British and French in 1860.

"It's a very controversial topic. It's a very nationalistic topic. It actually is pro-China, pro-Chinese. Ai Weiwei thought about this for sometime and thought that this body of work would be really great for New York City," said AW Asia Founder Larry Warsh.

"The very fact that we do not know where he is or when he will be released is very disturbing. Today we all stand in solidarity for millions around the word who want ai we wei quickly and safely released," said Mayor Michael Bloomberg.

Ai Weiwei has been an outspoken critic of the Chinese government and hasn't been seen or heard from since he was detained at Beijing Airport on April 3rd.

In addition to the sculpture installation at Grand Army Plaza near Central Park, there is also an exhibit on the artist at the nearby arsenal gallery.

A documentary titled "Ai Weiwei: Never Sorry" is also in the works.

"This story is more important than ever not just because of his situation but because of all the people in similar situation who are detained and not heard from," said Director Alison Klayman.

The sculptures will be on display through July 15th.

For more information, visit zodiacheads.com.