Prestressed concrete and bicycle: what they have in common

1. Step 1. Prestressed concrete — has part — Wire rope. Tensioned tendons.
2. Step 2. Wire rope — is part of — Funicular. A cable.
3. Step 3. Funicular — uses — Railway track. Rails.
4. Step 4. Railway track — is used in — Wright Flyer. The Flyer had no wheels: it took off along a wooden rail.
5. Step 5. Wright Flyer — was inspired by — Bicycle. The experience of the Wrights’ bicycle shop — chains, light structures, the idea of controlled instability.

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