As part of the Tokyo Hotaru Festival, 100,000 illuminated blue LEDs were released in the Sumida River. The large scale installation of solar-powered spheres was meant to mimic a swarm of fireflies that bobbed along the river by night. The lights were later caught downstream by giant nets. A dynamic and beautiful way of creating large scale art with small modular parts. River was once home to real fireflies, which were said to gather around clean, running water. Fireflies no longer inhabit the area. The Tokyo Hotaru festival is part of the city’s “Sumida River Renaissance” initiative. Makes the viewer think how due to pollution we are having to recreate the once natural phenomenon of the fireflies on the river electronically.