floating paper dolls downriver on March 3
A traditional Hinamatsuri (Doll Festival) custom where paper dolls are set adrift on a river to carry away impurities and misfortune.
On March 3rd, the children floated paper dolls down the river.
Compound of 流し (nagashi, 'flowing') + 雛 (hina, 'doll'). The custom originates from ancient purification rituals where dolls were used as substitutes to carry away impurities.