Hand axe and glasses: what they have in common

1. Step 1. Hand axe — is a kind of — Stone tool. A hand axe is a kind of stone tool.
2. Step 2. Stone tool — evolved into — Needle. Bone needles with an eye are part of the Palaeolithic toolkit.
3. Step 3. Needle — is made of — Bone. The first needles with an eye were carved from bone.
4. Step 4. Bone — is material for — Spectacle frame. The first frames were made of bone and horn.
5. Step 5. Spectacle frame — is part of — Glasses. A frame.

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