Triangular fabric wing and oil lamp: what they have in common

1. Step 1. Triangular fabric wing — is part of — Hang glider. A flexible Rogallo wing on a frame.
2. Step 2. Hang glider — is made of — Polyester. The sail.
3. Step 3. Polyester — evolved from — Nylon. The next synthetic fibre.
4. Step 4. Nylon — is material for — Hot air balloon. A light, strong envelope fabric.
5. Step 5. Hot air balloon — uses — Combustion. A fire heated the air inside.
6. Step 6. Combustion — is used in — Oil lamp. Burning oil gives the light.

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