Dark room box and steam locomotive: what they have in common

1. Step 1. Dark room box — is part of — Camera obscura. A darkened room or box.
2. Step 2. Camera obscura — evolved into — Camera. A camera is a camera obscura with a light-sensitive layer.
3. Step 3. Camera — evolved into — Smartphone camera. A smartphone camera keeps the layout of a camera: a lens forms an image on a light-sensitive surface.
4. Step 4. Smartphone camera — is part of — Lunokhod. TV cameras.
5. Step 5. Lunokhod — has part — Wheel. Wheels.
6. Step 6. Wheel — is part of — Steam locomotive. The steam engine turns the driving wheels.

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