Spinning slotted drum and glasses: what they have in common

1. Step 1. Spinning slotted drum — is part of — Zoetrope. A cylinder on an axle.
2. Step 2. Zoetrope — evolved into — Cinema. Optical toys prepared the idea of cinema.
3. Step 3. Cinema — uses — Cinématographe. Cinema began with the cinématographe.
4. Step 4. Cinématographe — has part — Lens. A lens.
5. Step 5. Lens — is part of — Glasses. Lenses.

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