Seen across multiple cultures all across the world.
The scientific explanation calls it chemiluminescence, caused by the organic decay of the swamps/bogs it occurs over.
"Tales of morgens are preserved in the British countryside, even in some parts of South West England. One example from western Somerset has a fisherman adopt an infant morgen, only to lose her when she grows up and returns to her parents' underwater palace."
Kitsune, focus of Inari
Kami; elements of the landscape, forces of nature, manifestations of musubi (結び), the interconnecting energy of the universe.
In nature, everything is related to something.
An object that can potentially house a kami spirit is called a yorishiro. A yorishiro that is inhabitated by a kami is a shintai. In spite of what their name may suggest, shintai are not themselves part of kami, but rather just temporary repositories.