LEGO bricks and bell: what they have in common

1. Step 1. LEGO bricks — uses — Interchangeable parts. Any brick fits any other.
2. Step 2. Interchangeable parts — works like — Movable type. Movable type is an early case of interchangeable parts: identical letters move from line to line.
3. Step 3. Movable type — evolved into — Linotype. Mechanized typesetting.
4. Step 4. Linotype — uses — Casting. It casts a line of type in metal.
5. Step 5. Casting — is used in — Bell. Casting.

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