A family was putting up a hummingbird feeder with four feeding stations (similar to one that hangs outside our kitchen window). Almost immediately it became popular with the hummingbirds that lived in the area. Two, three, or even four birds would feed at one time. The feeder would be refilled at least once a day.
Suddenly the usage decreased to almost nothing. The feeder needed filling only about once a week. The reason for the decreased usage soon became apparent. A male bird had taken over the feeder as his property. He was now the only hummingbird who used it. He would feed and then sit in a nearby tree, rising to attack any bird that approached his feeder. Guard duty occupied his every waking hour. He was an effective guard. The only time another bird got to use the feeder was when the self-appointed owner was momentarily gone to chase away an intruder.
That hummingbird was teaching a valuable lesson. By choosing to assume ownership of the feeder, he forfeited his freedom. He was no longer free to come and go as he wished. He was tied to the work of guarding his feeder, his STUFF. He was possessed by his possessions.