Arcade machine and plough: 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 — includes — Leaf spring. A spring.
4. Step 4. Leaf spring — is part of — Stagecoach. Leaf springs.
5. Step 5. Stagecoach — uses — Horse collar. It is pulled by horses.
6. Step 6. Horse collar — is used in — Plough. The horse collar made ploughing with horses possible.

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