People participate in the 36th annual Mermaid Parade in Coney Island on June 16, 2018 in New York City. (Photo by Stephanie Keith/Getty Images)

Ursula Sprecher and Andi Cortellini are obsessed with people’s hobbies. The two Swiss artists have spent the past seven years traveling across their native Switzerland photographing gatherings of like-minded people in a myriad array of interests and niche groups.

People make their way on an algae-covered beach in Qingdao, Shandong province, China, July 19, 2015. (Photo by Reuters/Stringer)

A PETA (People for the Ethical Treatment of Animals) activist with her body painted promotes veganism in Bangkok April 21, 2016. (Photo by Jorge Silva/Reuters)

People dance in a park on a foggy day in Huai'an, Jiangsu province, China October 10, 2017. (Photo by Reuters/China Stringer Network)

People wearing costumes walk during Halloween in Sierra Madre, California, U.S., October 31, 2017. (Photo by Mario Anzuoni/Reuters)

People dressed as zombies take part in a “Zombie Walk” parade in Athens, Greece, February 25, 2017. (Photo by Michalis Karagiannis/Reuters)

People play with foam at a water park in Yantai, Shandong province, China June 16, 2107. (Photo by Reuters/Stringer)