A harmonica fits in a pocket yet carries a whole mood, so dream books read it as simple, portable comfort. It is linked to wandering, solitude and the blues of the open road.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.