Compasses and refrigerator: what they have in common

1. Step 1. Compasses — is used in — Euclidean geometry. Constructions with compass and straightedge.
2. Step 2. Euclidean geometry — is used in — Sundial. The scale is marked by the angle of the shadow.
3. Step 3. Sundial — is made of — Stone. Sundials were hewn from stone.
4. Step 4. Stone — is material for — Ice house. Ice houses were built of stone and sunk into the ground.
5. Step 5. Ice house — evolved into — Refrigerator. The refrigerator replaced natural ice.

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