Underground water tunnel and industrial robot: what they have in common

1. Step 1. Underground water tunnel — is part of — Qanat. A gently sloping tunnel through which water flows to the fields.
2. Step 2. Qanat — is made of — Clay. Weak sections of a qanat were reinforced with clay rings.
3. Step 3. Clay — is material for — Spinning top. Or shaped from clay.
4. Step 4. Spinning top — works like — Gyroscope. A gyroscope is a top in a gimbal.
5. Step 5. Gyroscope — is part of — International Space Station. Control moment gyroscopes.
6. Step 6. International Space Station — has part — Industrial robot. The Canadarm2 robotic arm.

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