Bolt and nut and greenhouse: what they have in common

1. Step 1. Bolt and nut — is part of — Metal construction set. Screws and nuts.
2. Step 2. Metal construction set — uses — Interchangeable parts. Standard parts.
3. Step 3. Interchangeable parts — is used in — Prefabrication. Standard elements.
4. Step 4. Prefabrication — is used in — Crystal Palace. Prefabricated elements.
5. Step 5. Crystal Palace — was inspired by — Greenhouse. Paxton was a gardener and a builder of glasshouses.

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