Printing ink and telescope: what they have in common

1. Step 1. Printing ink — is part of — Newspaper. Printing ink.
2. Step 2. Newspaper — uses — Paper. Newsprint.
3. Step 3. Paper — is material for — Photometer. A photometer compares the illumination of paper screens.
4. Step 4. Photometer — uses — Reflection of light. Brightness is judged from reflected light.
5. Step 5. Reflection of light — is used in — Reflecting telescope. A mirror causes no chromatic aberration.
6. Step 6. Reflecting telescope — is a kind of — Telescope. A telescope.

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