The text uses the metaphor of a parrot tied to a tube. What does this represent and what is the advice given?

In Chapter 17, the metaphor of a parrot tied to a tube is used to explain the human condition. It suggests that our true self is like a free parrot, representing the pure Brahman, but we have become bound by our association with the body, which is the tube. We are deluded by the "Maya of infatuation," which has caused us to forget our true, unbound nature. The advice given is to advise oneself to wake up and quickly return to this true form. One must think clearly about the entanglement in the world of "me and you," release the feet that are held tight by attachment and ego, and, like the parrot, "fly high in the sky" toward spiritual freedom.