Computing device and oil lamp: what they have in common

1. Step 1. Computing device — includes — Abacus. A counting tool.
2. Step 2. Abacus — is made of — Stone. Counting was done with pebbles — the Latin calculus.
3. Step 3. Stone — is material for — Oil lamp. The first lamps were stone bowls (Lascaux).

Open Evothings