Airport and barrel: what they have in common

1. Step 1. Airport — is made of — Asphalt. Or asphalt.
2. Step 2. Asphalt — is material for — Motorway. Or asphalt.
3. Step 3. Motorway — has part — Interchange. Interchanges.
4. Step 4. Interchange — has part — Bridge. Flyovers.
5. Step 5. Bridge — has part — Arch. Stone bridges were built as arches.
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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