Flush toilet and typewriter: what they have in common

1. Step 1. Flush toilet — has part — Valve. The cistern’s float valve.
2. Step 2. Valve — is part of — Bellows. A valve in the bellows lets air in when they open and keeps it from escaping back.
3. Step 3. Bellows — is part of — Pipe organ. Bellows supply the air.
4. Step 4. Pipe organ — has part — Keyboard. Manuals were the first keyboards.
5. Step 5. Keyboard — is part of — Typewriter. The keys drive levers with type.

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