Umbilical fueling mast and barrel: what they have in common

1. Step 1. Umbilical fueling mast — is part of — Launch complex. It supplies fuel, communications and power.
2. Step 2. Launch complex — is made of — Concrete. The launch table is concrete.
3. Step 3. Concrete — evolved from — Roman concrete. A revival of Roman technology.
4. Step 4. Roman concrete — is material for — Amphitheatre. The Colosseum.
5. Step 5. Amphitheatre — has part — Arch. 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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