South-pointing chariot and glasses: what they have in common

1. Step 1. South-pointing chariot — is a kind of — Cart. A cart.
2. Step 2. Cart — evolved into — Chariot. A chariot is a lightened cart.
3. Step 3. Chariot — uses — Bit and bridle. Controlling the horses.
4. Step 4. Bit and bridle — is made of — Bone. Early cheekpieces were carved from antler and bone.
5. Step 5. Bone — is material for — Spectacle frame. The first frames were made of bone and horn.
6. Step 6. Spectacle frame — is part of — Glasses. A frame.

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