Narrow stone passages and freezer: what they have in common

1. Step 1. Narrow stone passages — is part of — Egyptian pyramid. Passages inside the mass.
2. Step 2. Egyptian pyramid — is made of — Stone. The pyramids are built of limestone and granite blocks.
3. Step 3. Stone — is material for — Ice house. Ice houses were built of stone and sunk into the ground.
4. Step 4. Ice house — evolved into — Refrigerator. The refrigerator replaced natural ice.
5. Step 5. Refrigerator — includes — Freezer. A refrigeration appliance.

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