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. Photographers Trevor Williams and Jonathan Galione took this photo series of the critters, called “The Weeping Stones”, off the coast of Okayama, Japan. Williams and Galione caught the creatures using raw bacon and jars, and the pair positioned them accordingly for their series. The animals were not harmed and returned back to the water shortly thereafter. Here: Large stones on the beach in Okayama, Japan appear to weep as bio-luminescent shrimp leave light trails in the night. (Photo by Trevor Williams/Jonathan Galione/Getty Images)





Bioluminescent sea fireflies glittering like diamonds on the rocks and sand. Okayama, Japan. August 2016. (Photo by Trevor Williams/Jonathan Galione/Getty Images)





Bioluminescent sea fireflies glittering like diamonds on the rocks and sand. Okayama, Japan. July 2016. (Photo by Trevor Williams/Jonathan Galione/Getty Images)





Bioluminescent sea fireflies glittering like diamonds on the rocks and sand. Okayama, Japan. August 2016. (Photo by Trevor Williams/Jonathan Galione/Getty Images)





Bioluminescent sea fireflies glittering like diamonds on the rocks and sand. Okayama, Japan. August 2016. (Photo by Trevor Williams/Jonathan Galione/Getty Images)





Bioluminescent sea fireflies glittering like diamonds on the rocks and sand. Okayama, Japan. August 2016. (Photo by Trevor Williams/Jonathan Galione/Getty Images)