Sundial gnomon and electrical grid: what they have in common

1. Step 1. Sundial gnomon — is part of — Sundial. A rod that casts a shadow.
2. Step 2. Sundial — is made of — Stone. Sundials were hewn from stone.
3. Step 3. Stone — is material for — Dam. Sadd el-Kafara (~2700 BC) is an embankment of stone.
4. Step 4. Dam — is part of — Hydroelectric power station. The dam creates the head of water.
5. Step 5. Hydroelectric power station — is a kind of — Power station. A kind of power station.
6. Step 6. Power station — is part of — Electrical grid. Power stations feed the grid.

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