Press platen and camera: what they have in common

1. Step 1. Press platen — is part of — Screw press. It transfers the force to the material.
2. Step 2. Screw press — is part of — Gutenberg printing press. Gutenberg adapted the screw press known from pressing grapes.
3. Step 3. Gutenberg printing press — uses — Paper. The impression is made on paper.
4. Step 4. Paper — is material for — Photometer. A photometer compares the illumination of paper screens.
5. Step 5. Photometer — includes — Exposure meter. A photometer.
6. Step 6. Exposure meter — is part of — Camera. A built-in light meter.

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