Square paper bag bottom and smartphone: what they have in common

1. Step 1. Square paper bag bottom — is part of — Paper bag. Margaret Knight’s rectangular bottom.
2. Step 2. Paper bag — is made of — Paper. Paper.
3. Step 3. Paper — is material for — Loudspeaker. The cone is paper.
4. Step 4. Loudspeaker — is part of — Smartphone. An earpiece speaker and a multimedia speaker.

Open Evothings