Water clock (clepsydra) and shipping container: what they have in common

1. Step 1. Water clock (clepsydra) — is made of — Stone. The clepsydra from Karnak is a stone vessel.
2. Step 2. Stone — is material for — Seaport. Quays and moles were built of stone.
3. Step 3. Seaport — has part — Container crane. Container cranes.
4. Step 4. Container crane — uses — Shipping container. It moves containers.

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