Doll head and submarine: what they have in common

1. Step 1. Doll head — is part of — Doll. The face is the main element.
2. Step 2. Doll — is made of — Porcelain. Porcelain dolls.
3. Step 3. Porcelain — is material for — Composite armour. Ceramic layers.
4. Step 4. Composite armour — is part of — Tank. Multi-layer armour.
5. Step 5. Tank — has part — Periscope. Observation devices.
6. Step 6. Periscope — is part of — Submarine. A periscope.

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