In this poem, the author compares the daffodils to several ideas, such as a "crowd" and "the milky way." He describes them in this way because of how the daffodils are placed. We learn that they are continuous, and that they are stretched in a "never-ending line." This, therefore, reminds the author of how the stars are placed in the Milky Way.
Thoreau has a possitive attitude toward the outdoors and believe that all people should return to nature as salvation for them. He believes that cities are bad for us.
