Abacus rods and screw press: what they have in common

1. Step 1. Abacus rods — is part of — Abacus. Guides for the beads.
2. Step 2. Abacus — is made of — Stone. Counting was done with pebbles — the Latin calculus.
3. Step 3. Stone — is material for — Cylinder seal. Seals were carved from stone.
4. Step 4. Cylinder seal — works like — Gutenberg printing press. An analogy: both a seal and a press reproduce a pre-carved pattern.
5. Step 5. Gutenberg printing press — has part — Screw press. Gutenberg adapted the screw press known from pressing grapes.

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