Indigo and camera: what they have in common

1. Step 1. Indigo — evolved into — Synthetic dye. Synthesizing natural dyes.
2. Step 2. Synthetic dye — is used in — Gram staining. Aniline dyes.
3. Step 3. Gram staining — uses — Microscope. For microscopy.
4. Step 4. Microscope — uses — Refraction of light. Magnification through refraction.
5. Step 5. 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.
6. Step 6. Camera obscura — evolved into — Camera. A camera is a camera obscura with a light-sensitive layer.

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