Investigator Davy Marin alerts us to this animation of a self-playing harp (or self-playing something-or-other):
This, on the other hand, is a build-it-yourself guide to a self-playing harmonica:
Investigator Davy Marin alerts us to this animation of a self-playing harp (or self-playing something-or-other):
This, on the other hand, is a build-it-yourself guide to a self-playing harmonica: