Music box and personal computer: what they have in common

1. Step 1. Music box — has part — Pinned cylinder. The cylinder’s pins pluck the teeth of the comb.
2. Step 2. Pinned cylinder — is part of — Carillon. Automatic carillons have a pinned drum.
3. Step 3. Carillon — has part — Keyboard. A keyboard.
4. Step 4. Keyboard — is part of — Personal computer. A keyboard.

Open Evothings