Papyrus and headphones: what they have in common

1. Step 1. Papyrus — evolved into — Paper. Paper displaced papyrus and parchment as a cheap writing material.
2. Step 2. Paper — is material for — Loudspeaker. The cone is paper.
3. Step 3. Loudspeaker — is part of — Headphones. Miniature drivers.

Open Evothings