Impeller and oil lamp: what they have in common

1. Step 1. Impeller — is part of — Vacuum cleaner. An impeller creates the suction.
2. Step 2. Vacuum cleaner — evolved from — Carpet sweeper. The mechanization of cleaning.
3. Step 3. Carpet sweeper — is made of — Plant fibre. The brush is bristle.
4. Step 4. Plant fibre — is material for — Wick. A wick is twisted from plant fibres.
5. Step 5. Wick — is part of — Oil lamp. The wick feeds oil to the flame.

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