Earth embankment and shipping container: what they have in common

1. Step 1. Earth embankment — is part of — Levee. An earth embankment.
2. Step 2. Levee — evolved into — Dam. A retaining structure.
3. Step 3. Dam — is made of — Stone. Sadd el-Kafara (~2700 BC) is an embankment of stone.
4. Step 4. Stone — is material for — Seaport. Quays and moles were built of stone.
5. Step 5. Seaport — has part — Container crane. Container cranes.
6. Step 6. Container crane — uses — Shipping container. It moves containers.

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