Abacus beads and shipping container: what they have in common

1. Step 1. Abacus beads — is part of — Abacus. Movable beads — the places of a number.
2. Step 2. Abacus — is made of — Stone. Counting was done with pebbles — the Latin calculus.
3. Step 3. Stone — is material for — Seaport. Quays and moles were built of stone.
4. Step 4. Seaport — has part — Container crane. Container cranes.
5. Step 5. Container crane — uses — Shipping container. It moves containers.

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