Plastic film and cannon: what they have in common

1. Step 1. Plastic film — is part of — Plastic bag. A thin polyethylene film.
2. Step 2. Plastic bag — evolved from — Paper bag. A replacement for paper.
3. Step 3. Paper bag — is made of — Paper. Paper.
4. Step 4. Paper — is material for — Fire lance. The barrel of a fire lance is a paper or bamboo tube.
5. Step 5. Fire lance — evolved into — Hand cannon. A metal barrel instead of bamboo.
6. Step 6. Hand cannon — evolved into — Cannon. A large hand cannon.

Open Evothings