Saxophone bell and stone tool: what they have in common

1. Step 1. Saxophone bell — is part of — Saxophone. It emits sound.
2. Step 2. Saxophone — has part — Woodwind key mechanism. More than 20 valves.
3. Step 3. Woodwind key mechanism — is part of — Flute. Boehm’s keys close the holes.
4. Step 4. Flute — is made of — Bone. The oldest flutes (Hohle Fels) were carved from bird bone and ivory.
5. Step 5. Bone — is material for — Needle. The first needles with an eye were carved from bone.
6. Step 6. Needle — evolved from — Stone tool. Bone needles with an eye are part of the Palaeolithic toolkit.

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