Flying buttress and CNC machine: what they have in common

1. Step 1. Flying buttress — is part of — Gothic cathedral. Flying buttresses.
2. Step 2. Gothic cathedral — has part — Tower clock. A tower clock.
3. Step 3. Tower clock — has part — Gear. A gear train drives the hands.
4. Step 4. Gear — is part of — Milling machine. A gear train drives the feed.
5. Step 5. Milling machine — evolved into — CNC machine. The first CNC machines were milling machines (MIT, 1952).

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