Stirrup and aeroplane: what they have in common

1. Step 1. Stirrup — evolved from — Saddle. The stirrup added a foot support to the saddle.
2. Step 2. Saddle — is part of — Bicycle. The bicycle saddle took its name from the horse saddle.
3. Step 3. Bicycle — inspired — Wright Flyer. The experience of the Wrights’ bicycle shop — chains, light structures, the idea of controlled instability.
4. Step 4. Wright Flyer — is a kind of — Aeroplane. The first aeroplane.

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