Reflective metal layer and rolling mill: what they have in common

1. Step 1. Reflective metal layer — is part of — Wall mirror. A silver or aluminium coating.
2. Step 2. Wall mirror — has part — Window glass. Sheet glass.
3. Step 3. Window glass — is part of — Gothic cathedral. Stained glass.
4. Step 4. Gothic cathedral — works like — Steel frame. A skeleton system: the frame carries the load, freeing the walls for windows.
5. Step 5. Steel frame — has part — I-beam. I-beams.
6. Step 6. I-beam — uses — Rolling mill. Rolling.

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