Street light and shipping container: what they have in common

1. Step 1. Street light — is part of — Tunnel. Lighting.
2. Step 2. Tunnel — uses — Tunnelling shield. Shield tunnelling.
3. Step 3. Tunnelling shield — uses — Hydraulic cylinder. The shield was pushed forward by jacks.
4. Step 4. Hydraulic cylinder — is part of — Forklift. Lifting the forks.
5. Step 5. Forklift — uses — Pallet. It works with pallets.
6. Step 6. Pallet — works like — Shipping container. Standardizing units of cargo.

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