Leather bellows bag and joystick: what they have in common

1. Step 1. Leather bellows bag — is part of — Bellows. It changes volume when squeezed.
2. Step 2. Bellows — is part of — Player piano. Pedal bellows create suction.
3. Step 3. Player piano — works like — Jacquard loom. A perforated medium controls a machine — a weaving one in one case, a musical one in the other.
4. Step 4. Jacquard loom — was inspired by — Automaton. Vaucanson, the maker of automata, built an automatic loom whose ideas Jacquard used.
5. Step 5. Automaton — has part — Spring. The mainspring stores the energy.
6. Step 6. Spring — is part of — Joystick. They return the stick to the centre.

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