Polarization of light and screw press: what they have in common

1. Step 1. Polarization of light — is used in — Polarizing filter. It passes one polarization.
2. Step 2. Polarizing filter — is made of — Celluloid. Land’s Polaroid is aligned crystals in a film.
3. Step 3. Celluloid — is made of — Cellulose. Nitrocellulose.
4. Step 4. Cellulose — is material for — Paper. Paper is cellulose fibres.
5. Step 5. Paper — is used in — Gutenberg printing press. The impression is made on paper.
6. Step 6. Gutenberg printing press — has part — Screw press. Gutenberg adapted the screw press known from pressing grapes.

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