Dispersion of light and joystick: what they have in common

1. Step 1. Dispersion of light — is a kind of — Refraction of light. A consequence of refraction.
2. Step 2. Refraction of light — is used in — Camera obscura. A lens makes the image sharper; the camera obscura itself works because light travels in straight lines.
3. Step 3. Camera obscura — evolved into — Camera. A camera is a camera obscura with a light-sensitive layer.
4. Step 4. Camera — has part — Shutter. A shutter.
5. Step 5. Shutter — has part — Spring. A spring mechanism.
6. Step 6. Spring — is part of — Joystick. They return the stick to the centre.

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