“In anatomy, heterochromia refers to a difference in coloration, usually of the iris (but also of hair or skin). Although infrequently seen in humans, complete heterochromia is more frequently observed in other species, where it almost always involves one blue eye”. – Wikipedia (Photo by StooMathiesen)

A model poses at Checkpoint Charlie, a historic place in the German capital to promote the fashion magazine “Sous” on June 12, 2012. (Photo by Maurizio Gambarini)

A woman smokes a mask bong on the final day of Hempfest, Seattle's annual gathering to promote the legalization of marijuana, on August 17, 2014. (Photo by Jordan Stead/Seattlepi.com)

Tour de France hostess wear face masks prior to the start of the first stage of the Tour de France cycling race over 156 kilometers (97 miles) with start and finish in Nice, southern France, Saturday, August 29, 2020. (Photo by Christophe Ena/AP Photo)

A member of a winter swimming club wears flippers during the celebration of Maslenitsa, also known as Pancake Week, a pagan holiday, marking the end of the winter, in Novosibirsk, Russia. (Photo by Alexandr Kryazhev/Sputnik/Profimedia)

A family takes a picture at the Oscar Myer Wienermobile during a visit to “The Flower Fields”, as California opens up from the pandemic, in Carlsbad, California, U.S., March 31, 2021. (Photo by Mike Blake/Reuters)

A man walks at the empty Karon beach on Phuket Island, Thailand on April 1, 2021. Picture taken with a drone. (Photo by Jorge Silva/Reuters)

Waxworks artists retouch the wax figures at the unveiling of Little Mix waxwork figures at Madame Tussauds, in London, Britain, July 28, 2021. (Photo by Aaron Chown/PA Images via Getty Images)