What happened to the humans in Flow? The director left hints
Briefly

Zilbalodis mentioned that while he didn't clarify the humans' fate in Flow, he left clues hinting at their previous existence and awareness of the floods.
He explained, 'The boat in the tree in the beginning of the film suggests that it's not the first time that this flood has come. It's kind of a recurring occurrence.'
The little black kitty starts his adventure in a house that has cat sketches and statues, suggesting a previous relationship with humans, now gone.
The stunning animation showcases a full range of emotions in animal characters, providing a tense yet beautiful journey through a post-human world.
Read at Polygon
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