Flying buttress and tank: what they have in common

1. Step 1. Flying buttress — is part of — Gothic cathedral. Flying buttresses.
2. Step 2. Gothic cathedral — works like — Steel frame. A skeleton system: the frame carries the load, freeing the walls for windows.
3. Step 3. Steel frame — has part — Rivet. Early frames were riveted.
4. Step 4. Rivet — is part of — Plate armour. Movable plates on rivets.
5. Step 5. Plate armour — evolved into — Armour. Armour moves from people to machines.
6. Step 6. Armour — is part of — Tank. Armour protects the crew.

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