The Soot Sprites (すすワタリ, Susuwatari, lit. "Travelling Soot"), also known as All Blacky (まっくろくろすけ, Makkuro-Kurosuke) are spirits that appear in the films My Neighbor Totoro and Spirited Away. They are small, round balls made from the soot that dwells in old and abandoned houses and leave black dirt in their wake. If the house becomes inhabited, they decide if the inhabitants are nice people. If they are, they will leave. According to Kamajī, Susuwatari was created by magic, and if they don't work
Sootballs/Susuwatari, Wiki
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totoro and susuwatari (studio ghibli and 1 more) drawn by zzzeus
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My Neighbor Totoro Review (Spoilers)
Not sure of anyone has already post this but- : r/wilbursoot
GC841Q0 Soot Sprites Delights (Multi-cache) in Virginia, United