Two glass bulbs and shipping container: what they have in common

1. Step 1. Two glass bulbs — is part of — Hourglass. Glass vessels.
2. Step 2. Hourglass — is used in — Chip log. The time of a speed measurement was taken with an hourglass.
3. Step 3. Chip log — has part — Rope. On a line with knots.
4. Step 4. Rope — evolved into — Wire rope. A steel counterpart of rope.
5. Step 5. Wire rope — is part of — Container crane. Cables.
6. Step 6. Container crane — uses — Shipping container. It moves containers.

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