Water level markings and bicycle: what they have in common

1. Step 1. Water level markings — is part of — Water clock (clepsydra). Hour marks on the wall.
2. Step 2. Water clock (clepsydra) — is made of — Stone. The clepsydra from Karnak is a stone vessel.
3. Step 3. Stone — is material for — Potter’s wheel. Early potter’s wheels were stone discs on an axle.
4. Step 4. Potter’s wheel — uses — Angular momentum. A heavy disc keeps spinning by inertia.
5. Step 5. Angular momentum — is used in — Bicycle. The spinning wheels and the steering geometry help keep balance.

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