Cover and radar: what they have in common

1. Step 1. Cover — is part of — Body armour. A carrying cover.
2. Step 2. Body armour — works like — Tank. One idea of protection — armour — at different scales.
3. Step 3. Tank — has part — Periscope. Observation devices.
4. Step 4. Periscope — is part of — Submarine. A periscope.
5. Step 5. Submarine — has part — Sonar. Underwater acoustics.
6. Step 6. Sonar — works like — Radar. The same echolocation principle: sound in water instead of radio waves.

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