Bifacially knapped stone surface and glasses: what they have in common

1. Step 1. Bifacially knapped stone surface — is part of — Hand axe. Flaking on both sides gives a symmetrical edge.
2. Step 2. Hand axe — is a kind of — Stone tool. A hand axe is a kind of stone tool.
3. Step 3. Stone tool — evolved into — Needle. Bone needles with an eye are part of the Palaeolithic toolkit.
4. Step 4. Needle — is made of — Bone. The first needles with an eye were carved from bone.
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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