Strange things on a beach
From the sea-caves of Criccieth yonder.'
I saw this and was reminded immediately of a poem by Robert Graves, "Welsh Incident" (you can read a copy here).
Things washed up on a beach are always so repulsive, in a slimy, or crusty, or tentacularly way. Alive, and underwater, they can look quite beautiful, but dead and washed up on a beach ... well, you look back on your footsteps in the sand and see wide detours.