A gallery spokesperson gives an interview during a preview for an exhibit by Chinese artist Ai Weiwei at the Asia Society in New York, June 29, 2011. A photography exhibit offering glimpses of Chinese artist and activist Ai Weiwei's time spent living in New York in the 1980s and early 1990s opened on Wednesday, marking the first major museum exhibit of his work since his release from detention. REUTERS/Brendan McDermid (UNITED STATES - Tags: ENTERTAINMENT SOCIETY)

A woman looks at photographs during a preview for an exhibit by Chinese artist Ai Weiwei at the Asia Society in New York, June 29, 2011. A photography exhibit offering glimpses of Chinese artist and activist Ai Weiwei's time spent living in New York in the 1980s and early 1990s opened on Wednesday, marking the first major museum exhibit of his work since his release from detention. REUTERS/Brendan McDermid (UNITED STATES - Tags: ENTERTAINMENT SOCIETY)

Notes are seen on a contact sheet of self portraits, displayed during an exhibit by Chinese artist Ai Weiwei at the Asia Society in New York, June 29, 2011. A photography exhibit offering glimpses of Chinese artist and activist Ai Weiwei's time spent living in New York in the 1980s and early 1990s opened on Wednesday, marking the first major museum exhibit of his work since his release from detention. REUTERS/Brendan McDermid (UNITED STATES - Tags: ENTERTAINMENT SOCIETY)

Visitors view an installation by Brazilian artist Lygia Pape, who died in 2004, entitled "Tteia" at Arsenale during the 53rd Biennale Internazional Art Exhibition in Venice June 7, 2009.
REUTERS/Alessandro Bianchi (ITALY SOCIETY)

A visitor takes a pictures of the installation by italians artists Giampaolo Bertozzi and Stefano Dal Monte Casoni entitled "Composizione non finita - infinita" (Not finished - infinite composition ) at italian pavilion during the 53rd Biennale Internazional Art Exhibition in Venice June 7, 2009. REUTERS/Alessandro Bianchi (ITALY)

Visitor views a collage of pictures as a tribute to Filippo Tommaso Marinetti, the founder of the Italian Futurism, at the Arsenale during the 53rd Biennale Internazional Art Exhibition in Venice June 7, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY)

Visitors view an installation by Brazilian artist Lygia Pape, who died in 2004, entitled "Tteia" at Arsenale during the 53rd Biennale Internazional Art Exhibition in Venice June 7, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY)

Singapore artist Ming Wong speaks while holding a Special Mention Award at the 53rd Biennale Internazional Art Exhibition in Venice June 6, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY)

Artist Sean Lennon (R) and his girlfriend model Charlotte Kemp Muhl kiss as they attend a Golden Lion Award Ceremony at the 53rd Biennale Internazional Art Exhibition in Venice June 6, 2009.
REUTERS/Alessandro Bianchi (ITALY SOCIETY ENTERTAINMENT)

Artist Sean Lennon (R) and his girlfriend model Charlotte Kemp Muhl attend during Golden Lion Award Ceremony at the 53rd Biennale Internazional Art Exhibition in Venice June 6, 2009.
REUTERS/Alessandro Bianchi (ITALY SOCIETY ENTERTAINMENT)

U.S. artist John Baldessari poses with his Golden Lion Award for Lifetime Achievement at the 53rd Biennale International Art Exhibition in Venice June 6, 2009.
REUTERS/Alessandro Bianchi (ITALY SOCIETY)

Artist Sean Lennon (R) and his girlfriend model Charlotte Kemp Muhl attend during Golden Lion Award Ceremony at the 53rd Biennale Internazional Art Exhibition in Venice June 6, 2009.
REUTERS/Alessandro Bianchi (ITALY SOCIETY ENTERTAINMENT)

Artist Yoko Ono gestures as she is congratulated by her fans after receiving a Golden Lion Award for Lifetime Achievement at the 53rd Biennale Internazional Art Exhibition in Venice June 6, 2009.
REUTERS/Alessandro Bianchi (ITALY SOCIETY ENTERTAINMENT)

Artist Yoko Ono poses with her Golden Lion Award for Lifetime Achievement at the 53rd Biennale Internazional Art Exhibition in Venice June 6, 2009.
REUTERS/Alessandro Bianchi (ITALY SOCIETY ENTERTAINMENT)

Artist Yoko Ono reacts prior to receiving a Golden Lion Award for Lifetime Achievement, next to director of the 53rd Biennale Internazional Art Exhibition Daniel Birnbaum (L), in Venice June 6, 2009.
REUTERS/Alessandro Bianchi (ITALY SOCIETY ENTERTAINMENT)

Artist Yoko Ono (C) is escorted as she leaves, after receiving a Golden Lion Award for Lifetime Achievement, at the 53rd Biennale Internazional Art Exhibition in Venice June 6, 2009.
REUTERS/Alessandro Bianchi (ITALY SOCIETY ENTERTAINMENT)

Artist Yoko Ono performs during her installation entitled "Anton's Memory" at the Arsenale during the vernissage of the 53rd Biennale Internazional Art Exhibition in Venice June 6, 2009. Contemporary artist Yoko Ono and U.S. artist John Baldessari will be honoured at the 2009 Venice Biennale with a Golden Lion Award for Lifetime Achievement. REUTERS/Alessandro Bianchi (ITALY SOCIETY ENTERTAINMENT)

Sean Ono Lennon and his girlfriend Charlotte Kemp Muhl play chess as his mother Yoko Ono (not pictured) performs during her installation entitled "Anton?s Memory" at the Arsenale during the vernissage of the 53rd Biennale Internazional Art Exhibition in Venice June 6, 2009. Contemporary artist Yoko Ono and U.S. artist John Baldessari will be honoured at the 2009 Venice Biennale with a Golden Lion Award for Lifetime Achievement. REUTERS/Alessandro Bianchi (ITALY SOCIETY ENTERTAINMENT)

Artist Yoko Ono performs during her installation entitled "Anton's Memory" at the Arsenale during the vernissage of the 53rd Biennale Internazional Art Exhibition in Venice June 6, 2009. Contemporary artist Yoko Ono and U.S. artist John Baldessari will be honoured at the 2009 Venice Biennale with a Golden Lion Award for Lifetime Achievement. REUTERS/Alessandro Bianchi (ITALY SOCIETY ENTERTAINMENT)

Artist Yoko Ono performs during her installation entitled "Anton's Memory" at the Arsenale during the vernissage of the 53rd Biennale Internazional Art Exhibition in Venice June 6, 2009. Contemporary artist Yoko Ono and U.S. artist John Baldessari will be honoured at the 2009 Venice Biennale with a Golden Lion Award for Lifetime Achievement. REUTERS/Alessandro Bianchi (ITALY SOCIETY ENTERTAINMENT)

Artist Yoko Ono performs during her installation entitled "Anton's Memory" at the Arsenale during the vernissage of the 53rd Biennale Internazional Art Exhibition in Venice June 6, 2009. Contemporary artist Yoko Ono and U.S. artist John Baldessari will be honoured at the 2009 Venice Biennale with a Golden Lion Award for Lifetime Achievement. REUTERS/Alessandro Bianchi (ITALY SOCIETY ENTERTAINMENT)

Artist Yoko Ono performs during her installation entitled "Anton's Memory" at the Arsenale during the vernissage of the 53rd Biennale Internazional Art Exhibition in Venice June 6, 2009. Contemporary artist Yoko Ono and U.S. artist John Baldessari will be honoured at the 2009 Venice Biennale with a Golden Lion Award for Lifetime Achievement. REUTERS/Alessandro Bianchi (ITALY SOCIETY ENTERTAINMENT)

Artist Yoko Ono (L) and her son Sean perform during her installation entitled "Anton's Memory" at the Arsenale during the vernissage of the 53rd Biennale Internazional Art Exhibition in Venice June 6, 2009. Contemporary artist Yoko Ono and U.S. artist John Baldessari will be honoured at the 2009 Venice Biennale with a Golden Lion Award for Lifetime Achievement. REUTERS/Alessandro Bianchi (ITALY SOCIETY IMAGES OF THE DAY)

A visitor views an installation by Chinese artist Huang Yong Ping entitled "Buddha's Hands " at the Arsenale during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 5, 2009.
REUTERS/Alessandro Bianchi (ITALY SOCIETY)

Italian artist Michelangelo Pistoletto (C) performs during his installation entitled "Twenty Two Less Two" during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 5, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY)

Italian artist Michelangelo Pistoletto (C) performs during his installation entitled "Twenty Two Less Two" during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 5, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY)

Italian artist Michelangelo Pistoletto gestures during his performance at his installation entitled "Twenty Two Less Two" during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 5, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY)

A visitor views an installation by Chilean artist Ivan Navarro entitled "Death Row" at the Arsenale during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 5, 2009.
REUTERS/Alessandro Bianchi (ITALY SOCIETY)

Italian artist Michelangelo Pistoletto (C) performs during his installation entitled "Twenty Two Less Two" during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 5, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY)

Italian artist Michelangelo Pistoletto (C) is seen reflected by mirror broken during his performance at his installation entitled "Twenty Two Less Two" during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 5, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY)

Italian artist Michelangelo Pistoletto (C) performs during his installation entitled "Twenty Two Less Two" during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 5, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY)

Japanese artist Miwa Yanagi is made up before an opening ceremony of her work entitled "Windswept Women" at the pavilion of Japan during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 5, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY HEADSHOT)

A visitor views pictures entitled "Windswept Women" by Japanese artist Miwa Yanagi of Japan during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 5, 2009.
REUTERS/Alessandro Bianchi (ITALY SOCIETY)

A visitor views paintings of gorillas entitled "La Solitude Organisative" (L) and "Flecha Rota" (R) by Spanish artist Miquel Barcelo of at the pavilion of Spain during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 5, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY)

A visitor views an installation at the Danish and the Nordic pavilion during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 3, 2009. REUTERS/Tony Gentile (ITALY SOCIETY)

A visitor views an installation by Argentine artist Tomas Saraceno entitled "Galaxies Forming along Filaments, Like Droplets along the Strands of a Spider?s Web" at the Palazzo delle Esposizioni at the Giardini during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 5, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY)

Visitors view an installation by Argentine artist Tomas Saraceno entitled "Galaxies Forming along Filaments, Like Droplets along the Strands of a Spider?s Web" at the Palazzo delle Esposizioni at the Giardini during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 5, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY)

Israeli artist Harush Shlomo performs a floating installation during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 4, 2009. REUTERS/Tony Gentile (ITALY SOCIETY)

Visitors view an installation at Abu Dhabi pavilion during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 4, 2009.
REUTERS/Tony Gentile (ITALY SOCIETY ENTERTAINMENT)

Sheikh Sultan Bin Tahnoon Al Nahyan (L) of the United Arab Emirates, accompanied by French curator Catherine David, visits the Abu Dhabi pavilion during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 4, 2009.
REUTERS/Tony Gentile (ITALY SOCIETY ROYALS ENTERTAINMENT)

Sheikh Sultan Bin Tahnoon Al Nahyan (C) of the United Arab Emirates, accompanied by French curator Catherine David (L), visits the Abu Dhabi pavilion during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 4, 2009.
REUTERS/Tony Gentile (ITALY SOCIETY ROYALS ENTERTAINMENT)

Sheikh Sultan Bin Tahnoon Al Nahyan (L) of the United Arab Emirates, accompanied by French curator Catherine David, visits the Abu Dhabi pavilion during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 4, 2009.
REUTERS/Tony Gentile (ITALY SOCIETY ROYALS ENTERTAINMENT)

Sheikh Sultan Bin Tahnoon Al Nahyan (C) of the United Arab Emirates arrives to attend the opening ceremony of the Abu Dhabi pavilion during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 4, 2009. REUTERS/Tony Gentile (ITALY SOCIETY ENTERTAINMENT ROYALS)

An installation by Krzysztof Wodiczko, titled "Guests", is displayed at Poland pavilion during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 4, 2009. REUTERS/Tony Gentile (ITALY SOCIETY ENTERTAINMENT)

An installation by Krzysztof Wodiczko, titled "Guests", is displayed at Poland pavilion during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 4, 2009,
REUTERS/Tony Gentile (ITALY SOCIETY ENTERTAINMENT)

A visitor views "Guests", an installation by Krzysztof Wodiczko at Poland pavilion during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 4, 2009,
REUTERS/Tony Gentile (ITALY SOCIETY ENTERTAINMENT)

Queen Sonja of Norway (C) is helped by artists and curators Michael Elmgreen (L) and Ingar Dragset (R) during the opening ceremony of pavilion of Norway and Denmark during the vernissage of the 53rd Biennale Internazional Art Exhibition in Venice June 4, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY ROYALS)

Queen Sonja of Norway gives her speech during the opening ceremony of pavilion of Norway and Denmark at the vernissage of the 53rd Biennale Internazional Art Exhibition in Venice June 4, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY ROYALS)

Queen Sonja (R) of Norway gives her speech during the opening ceremony of pavilion of Norway and Denmark at the vernissage of the 53rd Biennale Internazional Art Exhibition in Venice June 4, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY ROYALS)

An installation by Krzysztof Wodiczko, "Guests", is displayed at Poland pavilion during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 4, 2009,
REUTERS/Tony Gentile (ITALY SOCIETY ENTERTAINMENT)

A visitor views "Guests", an installation by Krzysztof Wodiczko at Poland pavilion during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 4, 2009,
REUTERS/Tony Gentile (ITALY SOCIETY)

Artists and curators Michael Elmgreen (R) and Ingar Dragset (L) pose during the opening ceremony of pavilion of Norway and Denmark during the vernissage of the 53rd Biennale Internazional Art Exhibition in Venice June 4, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY)

Minister of Culture Trond Giske (L) and Queen Sonja of Norway (3rd L) watch to pass the artist and curator Michael Elmgreen (R) during the opening ceremony of pavilion of Norway and Denmark during the vernissage of the 53rd Biennale Internazional Art Exhibition in Venice June 4, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY ROYALS)

Naomi Campbell (L) with her boyfriend Vladislav Doronin visit a pavilion of Switzerland during the vernissage of the 53rd Biennale Internazional Art Exhibition in Venice June 4, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY)

Naomi Campbell (L) with her boyfriend Vladislav Doronin visit a pavilion of Switzerland during the vernissage of the 53rd Biennale Internazional Art Exhibition in Venice June 4, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY)

Naomi Campbell (3 to L) with her boyfriend Vladislav Doronin (4 to L) arrive to visit the vernissage of the 53rd Biennale Internazional Art Exhibition in Venice June 4, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY)

Naomi Campbell (R) looks as her boyfriend Vladislav Doronin (C) kisses his friend during their visit to Russia's pavilion at the vernissage of the 53rd Biennale Internazional Art Exhibition in Venice June 4, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY)

Naomi Campbell (2 to L) with her boyfriend Vladislav Doronin (2 to R) leaves the Russia's pavilion during their visit at the vernissage of the 53rd Biennale Internazional Art Exhibition in Venice June 4, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY)

Naomi Campbell (L) cover her face as she leaves the Russia's pavilion with her boyfriend Vladislav Doronin (R) during their visit at the vernissage of the 53rd Biennale Internazional Art Exhibition in Venice June 4, 2009. REUTERS/Alessandro Bianchi (ITALY SOCIETY)

A visitor views takes picture of an installation at Greek pavilion during the vernissage of the 53rd Biennale International Art Exhibition in Venice June 4, 2009. REUTERS/Tony Gentile (ITALY SOCIETY)