Bifacially knapped stone surface and barrel: 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 — evolved into — Axe. A hand axe mounted on a handle.
3. Step 3. Axe — is made of — Stone. A Neolithic axe is ground stone on a handle.
4. Step 4. Stone — is material for — Aqueduct. Aqueducts are stone arches and channels.
5. Step 5. Aqueduct — has part — Arch. Roman aqueducts rested on arcades.
6. Step 6. Arch — works like — Barrel. Staves squeezed by hoops hold their shape by the same compression as the stones of an arch.

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