Stirrup tread and rolling mill: what they have in common

1. Step 1. Stirrup tread — is part of — Stirrup. A foot rest.
2. Step 2. Stirrup — evolved from — Saddle. The stirrup added a foot support to the saddle.
3. Step 3. Saddle — is part of — Bicycle. The bicycle saddle took its name from the horse saddle.
4. Step 4. Bicycle — inspired — Wright Flyer. The experience of the Wrights’ bicycle shop — chains, light structures, the idea of controlled instability.
5. Step 5. Wright Flyer — uses — Railway track. The Flyer had no wheels: it took off along a wooden rail.
6. Step 6. Railway track — uses — Rolling mill. Rails are rolled.

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