Naked riders seen participating during the World Naked Bike Ride to demonstrate the vulnerability of cyclists on city streets in London, United Kingdom on June 9, 2018. People chose to ride naked to celebrate cycling and body freedom. (Photo by Brais G. Rouco/SOPA Images/LightRocket via Getty Images)

Revelers participate in J'Ouvert, an overnight celebration the night before the West Indies Day Parade in Brooklyn, NY on September 3, 2018. Violence in past years led NYPD to shut down the parade route until 2am. (Photo by Stephen Yang)

A performer entertains the crowd during a rally in support of the leader of the Cameroonian opposition party Movement for the Rebirth of Cameroon (MRC) in Yaounde, on September 30, 2018, prior to the upcoming October 7, presidential elections. (Photo by Marco Longari/AFP Photo)

Yogis, Israeli and foreigners, participate in the Arava Yoga Annual festival at the ancient copper mines area of the Timna Valley, in the southern Arava region of Israel, north of Eilat on November 2, 2018. (Photo by Menahem Kahana/AFP Photo)

This aerial picture taken on the night of November 12, 2018 shows traffic on an elevated intersection in downtown Shanghai, China. (Photo by Johannes Eisele/AFP Photo)

In a photo taken on November 27, 2016 a female traffic police officer directs traffic on a road in Pyongyang. Believed to be hand-picked for their looks, Pyongyang's female traffic police are a familiar sight at intersections around the capital, where traffic volumes have noticeably increased in recent years. (Photo by Ed Jones/AFP Photo)

Praia du Forte, Bahia. “This was the lead picture for a National Geographic story on Bahia, because it was both mysterious as well as a “geography” picture showing where the slaves arrived from Nigeria. Beach pictures seem like they should be easy to take, but for me they are actually quite difficult. Too easy to fall into cliche. When I saw the kid coming on the horse, I quickly ran to see if I could make something with a woman in a bikini that was not a bikini shot”. (Photo by David Alan Harvey/The Guardian)

Mark Dill and Brit Thacker practice acro-yoga as approximately 70,000 people from all over the world gather for the 30th annual Burning Man arts and music festival in the Black Rock Desert of Nevada, U.S. August 29, 2016. (Photo by Jim Urquhart/Reuters)