Keyboard and elevator: what they have in common

1. Step 1. Keyboard — is part of — Linotype. A keyboard.
2. Step 2. Linotype — uses — Tin. A line is cast from type metal (lead, tin, antimony).
3. Step 3. Tin — is used in — Float glass. Glass spreads out over molten tin.
4. Step 4. Float glass — is material for — Skyscraper. Glazing.
5. Step 5. Skyscraper — has part — Elevator. A skyscraper is impossible without a lift.

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