Clay loom weights and gas lamp: what they have in common

1. Step 1. Clay loom weights — is part of — Warp-weighted loom. They tension the warp threads.
2. Step 2. Warp-weighted loom — is made of — Clay. The warp threads were tensioned with clay weights.
3. Step 3. Clay — is material for — Oil lamp. Later — clay ones.
4. Step 4. Oil lamp — evolved into — Incandescent light bulb. The electric lamp replaced oil and gas lamps.
5. Step 5. Incandescent light bulb — evolved from — Gas lamp. Electricity displaced gas lighting.

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