Mallets and glasses: what they have in common

1. Step 1. Mallets — is part of — Xylophone. Hammers for striking.
2. Step 2. Xylophone — uses — Resonance. Resonating bars.
3. Step 3. Resonance — is used in — Flute. Resonance of the air column.
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 — Spectacle frame. The first frames were made of bone and horn.
6. Step 6. Spectacle frame — is part of — Glasses. A frame.

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