Entertainers perform during the opening ceremony of the Tokyo 2020 Paralympic Games at the Olympic Stadium on August 24, 2021 in Tokyo, Japan. (Photo by Lisi Niesner/Reuters)

Kayla DiCello of the U.S. in action during the Women's All-Around Final at the World Artistic Gymnastics Championships in Kitakyushu, Japan, October 21, 2021. (Photo by Kim Kyung-Hoon/Reuters)

Prime Minister Theresa May meets Russian President Vladimir Putin during the G20 summit in Osaka, Japan on June 28, 2019. (Photo by Stefan Rousseau/PA Images via Getty Images)

Madison Chock and Evan Bates of the U.S. compete in the ice dance rhythm dance program at the Grand Prix of Figure Skating series competition in Tokyo, Japan, Friday, November 8, 2024. (Photo by Hiro Komae/AP Photo)

Tourists visit teamLab Planets Tokyo in Tokyo on January 10, 2025. Japan on January 15 will announce tourist figures for the year 2024, widely expected to break the record set in 2019. (Photo by Kazuhiro Nogi/AFP Photo)

Young Japanese women dressed in colourful Kimonos take a photo of themselves as they gather for a ceremony marking the “Coming of Age Day” at the Toshimaen Amusement Park in Tokyo, Japan, 11 January 2016. The Coming of Age Day is the day to celebrate young people who turn 20 years old while the age of 20 is considered the beginning of adulthood and is the minimum legal age for voting, drinking and smoking in Japan. (Photo by Kiyoshi Ota/EPA)

This photo provided by Jiji Press shows a Japan Airlines plane on fire on a runway of Tokyo's Haneda Airport on January 2, 2024. A Japan Airlines plane was in flames on the runway of Tokyo's Haneda Airport on January 2 after apparently colliding with a coast guard aircraft, television reports said. (Photo by JIJI Press/AFP Photo)

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)