Wool and glasses: what they have in common

1. Step 1. Wool — is material for — Trousers. The oldest trousers (Yanghai) were sewn from wool.
2. Step 2. Trousers — has part — Button. The waistband button.
3. Step 3. Button — is made of — Bone. Ancient buttons were carved from bone and shell.
4. Step 4. Bone — is material for — Spectacle frame. The first frames were made of bone and horn.
5. Step 5. Spectacle frame — is part of — Glasses. A frame.

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