A Federal Police officer guards outside a bar during a special operation at the Zona Norte area in Tijuana, Mexico, Friday, June 12, 2009. Federal Police officers ran an operation looking for drugs, weapons and illegal prostitution, archival inkjet print, 2008-2012. (Photo by Guillermo Arias, courtesy of the artist/Museum of Photographic Arts, San Diego)





A russian security guard passes by a graffiti featuring Portugal's player Cristiano Ronaldo in center Kazan, Russia, 15 June 2017. Portugal will face Mexico in a FIFA Confederations Cup 2017 Group A match at Kazan Arena on 18 June. (Photo by Mario Cruz/EPA)





A woman walks past graffiti by a Bali born street artist WD (Wild Drawing) in central Athens on October 11, 2017. An ongoing exhibition devoted to “Artists in Athens, City of Crisis” is taking place in the Greek capital. “Every wall of abandoned buildings is a canvas for us” says Greek Greek street artist Cacao Rocks and explains how the Greek capital hit by the financial crisis and then that of the migrants, is transformed into an “international meeting point” of Greek street art. (Photo by Louisa Gouliamaki/AFP Photo)





Street art by artists Gauche and Praxis in the Bushwick area of Brooklyn, New York. 08 August 2017. Many of the pieces are part of The Bushwick Collective – an outdoor gallery of artists from all over the world. Love is in the air in Florida, as these three lovebirds have formed an unlikely polyamorous relationship. The new bird in town is Rhea, a three-year-old Lovebird with the same disease as once-monogamous couple Indi and Lemon; Psittacine Beak and Feather Disease (PBFD). Indi’s new side-chick has a huge Instagram following with over 400,000 followers. (Photo by Adam Gray/Barcroft Images)





Australian artist Scott Marsh completes a mural artwork featuring the likeness of former Australian Prime Minister Tony Abbott marrying himself in a wedding dress in the Sydney suburb of Redfern, Australia September 11, 2017. (Photo by Dean Lewins/Reuters/AAP)





A man rides a bike near a mural supporting the referendum for independence of Kurdistan in Erbil, Iraq September 24, 2017. (Photo by Alaa Al-Marjani/Reuters)





Members of the armed forces take up position during a operation after violent clashes between drug gangs in Rocinha slum in Rio de Janeiro, Brazil on September 25, 2017. (Photo by Bruno Kelly/Reuters)





Tourists (top) stand as residents play on a slide, next to a public outdoor escalator in the “Comuna 13” neighborhood in Medellin, Colombia on September 16, 2017. (Photo by Nacho Doce/Reuters)





Сhildren play with balls near a wall of a district heating hub with the graffiti artwork “Forest Camp” created by Alexei Lazarev, a member of an artists' team, during a graffiti festival in Krasnoyarsk, Siberia, Russia October 9, 2017. (Photo by Ilya Naymushin/Reuters)





A man walks past an anti-U.S. mural in Tehran, Iran October 13, 2017. (Photo by Nazanin Tabatabaee Yazdi/Reuters/TIMA)





In this August 13, 2017 photo, a woman fleeing with her children and her home on her bank is seen on a street mural being designed and painted by asylum seekers along with Mexican artist Eva Bracamontes in Mexico City. Mexico has hosted large numbers of Central American refugees in the past, especially during the region’s civil wars of the 1970s and 1980s. But in recent years it has been better known as a perilous passageway to the United States in which northbound migrants often have been preyed upon by criminal gangs who rape, rob, kidnap and kill. (Photo by Rebecca Blackwell/AP Photo)





In this September 27, 2017 file photo, girls walk past a wall riddled with bullet holes from shootings between rival drug traffickers, at the Rocinha slum, in Rio de Janeiro, Brazil. Violence is on the rise in Rio's slums after several years of decline, and the killings of kids have shocked even residents long inured to deaths from gangs and police. (Photo by Silvia Izquierdo/AP Photo)





In this August 18, 2017 photo, a woman walks past the wall of a clothing store painted with the figure of a woman as advertising, next to phrase “No dumping garbage”, in Villa Cuauhtemoc, Mexico state. “This problem is difficult to eradicate because it is rooted in ideas that assume that we as women are worth less than men, that we as women can be treated like trash”, said Dilcya Garcia Espinoza de los Monteros, deputy state prosecutor for gender violence crimes, regarding femicides. (Photo by Rebecca Blackwell/AP Photo)





A mural adorns the wall of a cemetery that was painted by Polish artist Lukasz Zasadni, in the City of the Dead, a slum where half a million people live among tombs, in Cairo, Egypt, Monday, August 14, 2017. (Photo by Nariman El-Mofty/AP Photo)





This August 25, 2017 photo shows a couple swimming, framed by a concrete wall blanketed with graffiti, in the seaside slum La Perla, in San Juan, Puerto Rico. La Perla is suddenly a popular tourism spot thanks in part to this year's hit song “Despacito”, whose video became the most-watched in YouTube history. (Photo by Ricardo Arduengo/AP Photo)





Graffiti of a boy working on an electronic device is seen on a building riddled with holes from shrapnel dating back from the Lebanese civil war (1975-1990) in Beirut on September 26, 2017. (Photo by Joseph Eid/AFP Photo)





A man walks past a huge graffiti artwork depicting elephants in downtown Johannesburg, South Africa, 10 October 2017. The artwork by “Falko” is part of the newly formed graffiti tours that take people through the streets of the city to introduce them to the graffiti and who painted them. (Photo by Kim Ludbrook/EPA/EFE)





A woman walks past a work by a Bali-born graffiti artist WD (Wild Drawing) in central Athens on October 11, 2017. WD and Cacao Rocks, are taking part in an ongoing exhibition devoted to “Artists in Athens, City of Crisis”. 'Every wall of abandoned buildings is a canvas for us' says Cacao Rocks and explains how the Greek capital hit by the financial crisis and then that of the migrants, is transformed into an “international meeting point” of street art. (Photo by Louisa Gouliamaki/AFP Photo)