Arcade machine and stone tool: what they have in common

1. Step 1. Arcade machine — evolved from — Pinball. Coin-operated entertainment.
2. Step 2. Pinball — has part — Spring. A plunger.
3. Step 3. Spring — is part of — Flintlock. A mainspring.
4. Step 4. Flintlock — is made of — Flint. A flint strikes the spark.
5. Step 5. Flint — is material for — Stone tool. Tools were knapped from flint and other rocks with a sharp fracture.

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