Monthly calendar pages and glasses: what they have in common

1. Step 1. Monthly calendar pages — is part of — Wall calendar. A grid of days.
2. Step 2. Wall calendar — is made of — Paper. Calendars were printed on paper.
3. Step 3. Paper — is made of — Cellulose. Paper is cellulose fibres.
4. Step 4. Cellulose — is material for — Celluloid. Nitrocellulose.
5. Step 5. Celluloid — is material for — Sunglasses. The frames are celluloid.
6. Step 6. Sunglasses — evolved from — Glasses. Glasses with dark lenses.

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