Eraser and glasses: what they have in common

1. Step 1. Eraser — is used in — Pencil. Erasing.
2. Step 2. Pencil — is made of — Graphite. The lead is graphite mixed with clay.
3. Step 3. Graphite — is a kind of — Carbon. A form of carbon.
4. Step 4. Carbon — is material for — Photocopier. Toner is carbon black in resin.
5. Step 5. Photocopier — has part — Lens. Optics.
6. Step 6. Lens — is part of — Glasses. Lenses.

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