Camille Kovalev and Pavel Kovalev of France compete in the Pairs Short Program during the ISU World Figure Skating Championships at Saitama Super Arena on March 22, 2023 in Saitama, Japan. (Photo by Kim Kyung-Hoon/Reuters)

Flag bearers Bunpichmorakat Kheun and Sokong Pen of Team Cambodia during the Opening Ceremony of the Tokyo 2020 Olympic Games at Olympic Stadium on July 23, 2021 in Tokyo, Japan. (Photo by Kai Pfaffenbach/Reuters)

A diving competitor during a practice session at Tokyo Aquatics Centre ahead of the Tokyo 2020 Olympic Games in Japan on Wednesday, July 21, 2021. (Photo by Stefan Wermuth/Reuters)

Yndiara Asp of Brazil takes part in a women's Park Skateboarding training session at the 2020 Summer Olympics, Saturday, July 31, 2021, in Tokyo, Japan. (Photo by Ben Curtis/AP Photo)

Kimono-clad young women take their selfies near a venue during the Coming of Age Day celebration ceremony in Yokohama, Japan on January 9, 2023. (Photo by Kim Kyung-Hoon/Reuters)

A model shows creations of ACUOD by CHANU during Amazon Fashion Week TOKYO in Tokyo, Japan, March 21, 2019. (Photo by Kim Kyung-hoon/Reuters)

Suzuki's Hanare concept car is displayed during the Tokyo Motor Show, in Tokyo, Japan on October 23, 2019. The 46th Tokyo Motor Show will be op​en​ to the general public from 25 October to 04 November 2019. (Photo by Soe Zeya Tun/Reuters)

Those lights are actually bioluminescent shrimp, better known as sea fireflies, or, in Japan, as “umibotaru”. Visible every year from May until the end of October, they live in the sand around very shallow sea water and are often seen floating between the extremes of high and low tides. Here: Bioluminescent sea fireflies glittering like diamonds on the rocks and sand. Okayama, Japan. July 2016. (Photo by Trevor Williams/Jonathan Galione/Getty Images)