Trousers and greenhouse: what they have in common

1. Step 1. Trousers — includes — Jeans. Trousers.
2. Step 2. Jeans — has part — Rivet. Copper rivets on the pockets.
3. Step 3. Rivet — is part of — Steel frame. Early frames were riveted.
4. Step 4. Steel frame — works like — Gothic cathedral. A skeleton system: the frame carries the load, freeing the walls for windows.
5. Step 5. Gothic cathedral — has part — Window glass. Stained glass.
6. Step 6. Window glass — is part of — Greenhouse. It lets light in and holds heat.

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