Sewing machine and headphones: what they have in common

1. Step 1. Sewing machine — has part — Needle. A needle with the eye near its point.
2. Step 2. Needle — is made of — Bone. The first needles with an eye were carved from bone.
3. Step 3. Bone — is material for — Bit and bridle. Early cheekpieces were carved from antler and bone.
4. Step 4. Bit and bridle — has part — Headband. Straps on the head.
5. Step 5. Headband — is part of — Headphones. A band that presses the cups.

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