I have been seeking a folk song. Several years ago, while I was my mother's sole carer and thus not my usual otherwise alert self, I happened across a television programme of a folksong gathering. A woman described the folk tale behind the song she was about to sing - perhaps in Gaelic (Irish, or Scottish, I cannot remember).
It was the story which gripped my mind. I do not remember it at all clearly except the bare bones:
There were two sisters; one - let's call her Catriona - had a lover that the other - let's call her Fiona - coveted. So while Catriona fell asleep at the low tide edge, Fiona tied her hair to the rocks. The tide inevitably came in, and Fiona walked off with the lover.
I cannot remember enough details to google effectively, so have not been able to track down the folk song, or the tale. I keep trying at odd moments, but meanwhile the worm has been at work in my mind. The seaweed on the shores of the Outer Hebrides provided the hair.
It is not a literal illustration of a mis-remembered story, but what hearing the story generated within my well-established relationship with the sea. After my return from holiday I have been working on the idea above.