Egyptian bootblacks cleaning a European's shoes in Cairo. (Photo by Hulton Archive/Getty Images). Circa 1870

A man with a mask poses for a portrait as he takes part in festivities in honour of patron saint San Jeronimo in Masaya city, Nicaragua November 20, 2016. (Photo by Oswaldo Rivas/Reuters)

A sacrificial camel gets a haircut with patterns at the animal market on the outskirts of Karachi, Pakistan September 22, 2015. Muslims across the world are preparing to celebrate the annual festival of Eid al-Adha or the Feast of the Sacrifice, which marks the end of the annual haj pilgrimage, by slaughtering goats, sheep, cows and camels in commemoration of the Prophet Abraham's readiness to sacrifice his son to show obedience to Allah. Eid al-Adha in India falls on September 25. (Photo by Akhtar Soomro/Reuters)

Aenne Schwarz as a “daughter” and Anna Sophie Krenn on Thursday, September 8, 2017, during the photoprobe of “Paradies flood / Lost symphony / Part one of the klimatrilogie” in the Akademietheater in Vienna, Austria. The piece premiered on September 9, 2017. (Photo by Georg Hochmuth/APA)

Participants enjoy the “Color Me Run” festival in Hanoi, Vietnam, 28 May 2016. The festival which was inspired by the Holi Festival from India, attracted thousands of teenagers this year. (Photo by Luong Thai Linh/EPA)

Bedouin breeders fix a robot jockey mounted on a camel before the 18th International Camel Racing festival at the Sarabium desert in Ismailia, Egypt, March 12, 2019. Several Gulf countries have banned child jockeys from the traditional Bedouin sport after rights groups said the youngsters were often injured and some had been abducted or sold by their families. (Photo by Amr Abdallah Dalsh/Reuters)

Tibetan monks dressed as demons attend the Beating Ghost festival at the Yonghe Temple, also known as the Lama Temple, in Beijing on March 19, 2015. The Beating Ghost festival, or Da Gui festival in Chinese, is an important ritual of Tibetan Buddhism and is believed to expel evil spirits and shake off troubles. (Photo by Wang Zhao/AFP Photo)

A young man with the date 25 painted on his face, gives the victory sign in Tahir Square ahead of the first anniversary of the revolution on January 24, 2012 in Cairo, Egypt. (Photo by Jeff J Mitchell/Getty Images)