Macadam road and electric fan: what they have in common

1. Step 1. Macadam road — is a kind of — Paved road. A road.
2. Step 2. Paved road — includes — Bike lane. A road.
3. Step 3. Bike lane — uses — Bicycle. For bicycles.
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 — Wind tunnel. The Wrights built their own wind tunnel.
6. Step 6. Wind tunnel — has part — Electric fan. A fan.

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