Hole through a cylinder and modem: what they have in common

1. Step 1. Hole through a cylinder — is part of — Cylinder seal. A hole for the cord.
2. Step 2. Cylinder seal — works like — Gutenberg printing press. An analogy: both a seal and a press reproduce a pre-carved pattern.
3. Step 3. Gutenberg printing press — uses — Paper. The impression is made on paper.
4. Step 4. Paper — is material for — Loudspeaker. The cone is paper.
5. Step 5. Loudspeaker — is part of — Telephone. The earpiece reproduces the other person’s voice.
6. Step 6. Telephone — is used in — Modem. It works over a telephone line.

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