Corpuscular and wave optics and barrel: what they have in common

1. Step 1. Corpuscular and wave optics — evolved into — Reflecting telescope. Newton built a reflector while explaining the chromatic aberration of lenses.
2. Step 2. Reflecting telescope — has part — Mirror. The primary mirror.
3. Step 3. Mirror — is part of — Glass dome. A mirrored cone directs light into the hall.
4. Step 4. Glass dome — is a kind of — Dome. A dome.
5. Step 5. Dome — evolved from — Arch. A dome is an arch rotated around an axis.
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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