Coin edge and kite: what they have in common

1. Step 1. Coin edge — is part of — Coin. The edge of the coin.
2. Step 2. Coin — evolved into — Paper money. A replacement for metal money.
3. Step 3. Paper money — is made of — Paper. Paper.
4. Step 4. Paper — is material for — Hot air balloon. It was lined with paper on the inside.
5. Step 5. Hot air balloon — is made of — Silk. The Montgolfier balloon was fabric lined with paper.
6. Step 6. Silk — is material for — Kite. Chinese kites were silk.

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