Cat’s eye and glasses: what they have in common

1. Step 1. Cat’s eye — has part — Retroreflector. A retroreflector.
2. Step 2. Retroreflector — uses — Reflection of light. A corner-cube prism.
3. Step 3. Reflection of light — is used in — Reflecting telescope. A mirror causes no chromatic aberration.
4. Step 4. Reflecting telescope — is a kind of — Telescope. A telescope.
5. Step 5. Telescope — evolved from — Glasses. The first telescopes were assembled by spectacle makers.

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