Barrel staves and laser: what they have in common

1. Step 1. Barrel staves — is part of — Barrel. Curved oak planks.
2. Step 2. Barrel — works like — Arch. Staves squeezed by hoops hold their shape by the same compression as the stones of an arch.
3. Step 3. Arch — evolved into — Dome. A dome is an arch rotated around an axis.
4. Step 4. Dome — includes — Glass dome. A dome.
5. Step 5. Glass dome — has part — Mirror. A mirrored cone directs light into the hall.
6. Step 6. Mirror — is part of — Laser. A resonator made of mirrors.

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