Alloy wheel and gutenberg printing press: what they have in common

1. Step 1. Alloy wheel — is a kind of — Wheel. A wheel.
2. Step 2. Wheel — is part of — Steam locomotive. The steam engine turns the driving wheels.
3. Step 3. Steam locomotive — has part — Watt steam engine. A steam locomotive is driven by a steam engine.
4. Step 4. Watt steam engine — is part of — Rotary printing press. The first rotary presses were steam-driven.
5. Step 5. Rotary printing press — evolved from — Gutenberg printing press. Cylinders instead of a flat press.

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