Joystick and sewage treatment plant: what they have in common

1. Step 1. Joystick — is used in — Fly-by-wire. A sidestick controller.
2. Step 2. Fly-by-wire — is used in — Jet airliner. Fly-by-wire.
3. Step 3. Jet airliner — has part — Pressurized cabin. A pressurized cabin.
4. Step 4. Pressurized cabin — has part — Compressor. Air is bled from the engine compressors.
5. Step 5. Compressor — is part of — Sewage treatment plant. Blowers supply oxygen to the microbes.

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