Viewing slits and oil lamp: what they have in common

1. Step 1. Viewing slits — is part of — Zoetrope. Slits show the frames one at a time.
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 — Magic lantern. Lenses.
6. Step 6. Magic lantern — uses — Oil lamp. The light source is an oil lamp.

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