[[Lantern]] floating in water.

They're often seen in "Ghost Festival":[https://en.wikipedia.org/wiki/Ghost_Festival] (Chinese Zhongyuan Jie or Japanese "Obon":[https://en.wikipedia.org/wiki/Bon_Festival]) and some "Lantern festivals":[https://en.wikipedia.org/wiki/Lantern_Festival] such as Thailand "Loi Krathong":[https://en.wikipedia.org/wiki/Loi_Krathong]. In both Taoists and Buddhists, releasing lanterns on water is known as a ritual to transmute and absolve the sufferings of the deceased.

h4. See also
* [[sanzu river]]
* [[sky lantern]]
灯籠流し 灯篭流し とうろうながし 水燈 流燈