Sea-Current.

In the blood of man there is a tide, an old sea-current rather, that is somehow akin to the twilight, which brings him rumours of beauty from however far away, as driftwood is found at sea from islands not yet discovered: and this spring-tide of current that visits the blood of man comes from the fabulous quarter of his lineage, from the legendary, the old; it takes him out to the woodlands, out to the hills; he listens to ancient song. 

Lord Dunsany, from The Book of Wonder's, "The Bride of the Man-Horse"