Banksy

British graffiti artist, Banksy known for his antiauthoritarian art, often done in public places.
his work involved with political issue and social issue, such as anti-war, anti-capitalist or anti-establishment. Subjects include rats, monkeys, policemen, soldiers, children, and the elderly.
what is so great about him is he thinks about the message that puts on the public, after people see it, they understand the meaning immediately.
He works have been gone mainstream in modern art world, the reason is it speak the truth about the world. persuading people to accept our ideas and do what we want them to do is a basic universal human activity, but as people we have ability to change that by becoming knowledgeable, so no one can fool as.

Execution

Execution is a Chinese art painting by Beijing artist Yue Minjun.The piece was inspired by the Tiananmen Square protests of 1989, though the artist has also mentioned through translation that the art should not depict what happened at Tiananmen square. In 2007 it became the most expensive work sold by a Chinese contemporary artist.
from my vision, there is a key distinction between "Execution" and Francisco de Goya's "The Third of May, 1808: The Execution of the Defenders of Madrid" and Edouard Manet's "The Execution of the Emperor Maximilien of Mexico."

the painting shows a murder, true assassination of a political figure. But here, it's far more potent. Because they're killed by culture. The laughing was a response to unimaginable persecution, like you don't know what the hell else to do. You're nervous. You're not laughing, 'Ha ha hee hee.'" As for the underwear, You're stripped down, you're defenseless. Even worse, you're being shot with cultural forces, not bullets.

vacuum cleaners

one of a number of American artists to emerge in the 1980s with an aesthetic devoted to the decade's pervasive consumer culture. Koons used his work to reflect the commercial systems of the modern world.

His vacuum cleaners encased in perspex (1980–81; see 1993 exh. cat., pls 5–9) were classified as monuments to sterility. His immaculate replicas of domestic products, advertisements, kitsch toys and models exercised an enthusiastic endorsement of unlimited consumption, unlike the veiled criticism of some work of the first generation of Pop artists. Koons perceived Western civilization as a driven society, flattered by narcissistic images and with a voracious appetite for glamorous commodities.

Koons managed to shock the art world with one audacious work after another, from displaying commercial vacuum cleaners and basketballs as his own art to making porcelain reproductions of kitsch objects to showing homemade pornography.

Mao

Mao, 1972 by Andy Warhol,
Mao is one of a series of silkscreened portraits of the Chinese Communist leader Mao Zedong that Warhol produced in 1973. Nearly 15 feet tall, this towering image mirrors representations that were displayed throughout China during and after the Cultural Revolution (1966-76). The original picture is a rectangle approximately one-third again as long as it is wide and the Chairman looks directly toward the camera with a benevolent expression on his face. He seems to have a slight, kindly smile but is, at the same time, clearly a serious person.
In this paintings Warhol made many points about applying mechanized methods of reproduction to "fine arts," thereby turning fine art into consumer goods.