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liminal ball pit
(sopuli.xyz)
Liminal spaces are the subject of an Internet aesthetic portraying empty or abandoned places that appear eerie, forlorn, and often surreal. Liminal spaces are commonly places of transition (pertaining to the concept of liminality) or of nostalgic appeal.
https://en.wikipedia.org/wiki/Liminal_space_(aesthetic)
If you don't get annoyed by her holding a glass of a misterious liquid nearly the full video.
According to the video description, it is homemade blueberry iced tea.