Content: Home is created by people. People gave the bird in the cage a home, but destroyed the bird outside the cage.

Birds envy people with similar families, not the comfortable life in cages, but the place where they can live. They don't talk about the wide world outside, they can fly freely, and only talk about home, because no matter how far or how long they fly, they have to have a home. Unfortunately, there are only stumps outside. Everyone has a family, but they always want to go out and travel. Finally, when I came back, I found that there was nothing left. I began to envy other people with families and other families, but I didn't know that everything was caused by myself, so people should not envy others until they destroyed something, something they once owned. Trees are the lungs of the earth. Humans make birds homeless, envy caged birds, and cut off their homes and lives.