Echo

            
In music, some of the most haunting melodies are because of the use of Echo. Isn't that a lovely word on its own, Echo? Echoes of the surf in sea-shells, of birdsong ringing back from canyon walls, valley walls. What scope are there for describing..

Scents.. for a reader to remember with nostalgia, a drift of lilac perfume, of roses, or gorse blossom with the sun on it. Must, I think, evoke a picture of it before them.