The microbes kept alive by one lit microscope lamp call the salmon home

Evidence

Out beyond the surf they gather, tasting the waters of home. They see it against the dark of the headland. Someone has left a light on, blazing a tiny beacon into the night, calling the salmon back home. — Robin Wall Kimmerer, Braiding Sweetgrass, 928

Categorization

• XREF: The single microscope light kept burning is a stunning image of ceremony-keeping that parallels the mothering-caretaking thread (ch 22) and the sacred-water watching in the polyad.
• STORYSTEM: The kept-burning light as an act that summons a returning species could seed a speculative or realist story about caretaking machines/routines that keep a world present.
• FICTION: The image of a light left on to call beings home across a dark water has strong mythic resonance usable in worldbuilding.