Hierapolis sawmill and paper machine: what they have in common

1. Step 1. Hierapolis sawmill — evolved into — Sawmill. The oldest known example of a sawmill.
2. Step 2. Sawmill — uses — Saw. The cutting tool is a saw.
3. Step 3. Saw — is used in — Jigsaw puzzle. Cut out with a fretsaw.
4. Step 4. Jigsaw puzzle — is made of — Wood pulp. Cardboard.
5. Step 5. Wood pulp — is used in — Paper machine. The raw material.

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