The word being looked for in this problem would most probably be and most likely to be the word dream or vision.
A dream or vision is a device used to tell a story, usually an allegory, within a story. This is usually utilized to establish a deeper understanding of the story or of the character or characters. This could greatly affect the plot or not. This might also pave a way as to the manipulation of the reader's or watcher's thinking of the possible outcome of the story.
I'm making a assumption that the poem intends that, nothing gold can stay. like a leaf eventually will die and a tree will wither away and the sun will turn into the moon, basically nothing stays the same, eventually time will go forward and things will change. makes sense?
Literature is read for various reasons. For example, some people read literature to understand other people better. Others read it for escapism. Entertainment is another common reason. All of these reasons depend on the author providing the reader with new information that is different to their own experiences of the world. If the author does not tell the reader more than he already knows, it is unlikely that the reader will be informed or entertained by the work.
<h3>How work of literature provide something new information?</h3>
A work of literature must provide us with something new in order for the time spent in consuming it be worthwhile. The Book Thief tells us of hard facts but it also provides us with something else, how a life of young child harboring a wanted man is changed after the fact. In the Lord of the Rings, a fantasy world is so vivid and wide that you yourself can navigate through it.
Thus, this could be the answer.
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