[Faline]

On May 5, 2012, 100,000 blue LED spheres floated down the Sumida River in central Tokyo to kick off the inaugural two day Tokyo Hotaru Festival. The LED’s dubbed prayer stars were provided by Panasonic, who stated the spheres were 100% solar powered and designed to be large enough so they wouldn’t be swallowed by fish.
The LEDs are meant to resemble hotaru (fireflies) as they float gently down the river. Onlookers gathered on the river’s edge to take in the surreal event. Japanese design blog Spoon & Tamago were the first to cover this, stating that there are many literary references regarding the Sumida River once being a haven for fireflies.
For those wondering what happened with all of those LED balls, they were captured in a large net downstream.

[DannyDrama]

Looks like the lake in my neighbours garden after he's had a party. Every glow-stick ends up in that thing by morning.

[AndLG]

mustve been beautiful

[Lion-hearted Girl]

Stunning! Thanks Kelly!

[Space Particle]

Thats quite lovely

[Sharon]

That looks so pretty!! Quite enchanting too. Wish they'd dump a load of them into the River Thames. I'd sit outside the pub at night with my beloved and it would be so romantic - stars in the water <3

[Sandbwoy]

Would have been an amazing sight to see that in person

[K-Blast]

wow, what gorgeous photographs. I would have loved to have seen that in person.