Cups and aeroplane: what they have in common

1. Step 1. Cups — is part of — Anemometer. Hemispherical cups turned by the wind.
2. Step 2. Anemometer — is part of — Weather station. An anemometer.
3. Step 3. Weather station — has part — Barometer. A barometer.
4. Step 4. Barometer — evolved into — Altimeter. An altimeter is a barometer with an altitude scale.
5. Step 5. Altimeter — is part of — Cockpit. An altimeter.
6. Step 6. Cockpit — is part of — Aeroplane. A cockpit.

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