Describe the beauty of nature in …

In these lines, we get more beautiful landscape imagery: a breeze stirring the grass and the river flowing like glass (that's a simile if you're scoring at home).The speaker emphasizes all the wonderful things that the bird is missing out on. If it's in a cage, our little birdie can't enjoy flying on that beautiful breeze, or drinking from that flowing river.We can also see a lot of consonance in these lines, especially in the repetition of the letter S. Just try saying these lines out loud: "When the wind stirs soft through the springing grass/ And the river flows like a stream of grass."Hear those soft sounds sliding forth?This sound play isn't just there to make these lines sound pretty. It's serving a purpose. If we imagine the wind stirring, it makes this "sss" sound, doesn't it? And so does water flowing in a river. Check out "Sound Check" for more on this technique.