Papyrus and plumbing: what they have in common

1. Step 1. Papyrus — evolved into — Paper. Paper displaced papyrus and parchment as a cheap writing material.
2. Step 2. Paper — is material for — Paper coffee filter. Paper.
3. Step 3. Paper coffee filter — works like — Water filter. Filtering a liquid through a porous medium.
4. Step 4. Water filter — is used in — Water treatment plant. Sand filters.
5. Step 5. Water treatment plant — is used in — Plumbing. Treated water.

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