Which ancient poems have poems that express imagination (important poems)

There are many imaginary images in ancient poems, because art comes from reality and is higher than reality. If the content of imagination is "now go straight to the Milky Way, go to Petunia and Weaver's home"; If the imaginary state is "before me, where is the lost era?" Behind me, where are the future generations? I think of heaven and earth, there is no limit, there is no end, I am alone, and my tears fall down ","You live at the head of the Yangtze River, I live at the end of the Yangtze River, I miss you every day, I drink the Yangtze River water "and so on.