Cone-shaped paper filter and electrical telegraph: what they have in common

1. Step 1. Cone-shaped paper filter — is part of — Paper coffee filter. Pleats shaped like a funnel.
2. Step 2. Paper coffee filter — works like — Water filter. Filtering a liquid through a porous medium.
3. Step 3. Water filter — is made of — Silica (sand). Slow filters are layers of sand and gravel.
4. Step 4. Silica (sand) — is material for — Internet. The backbones are silica optical fibre.
5. Step 5. Internet — uses — Packet switching. Data is sent in packets.
6. Step 6. Packet switching — works like — Electrical telegraph. An analogy: telegraph messages were passed from station to station with intermediate storage — a “store and forward” principle similar to packet transmission.

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