Percy Shelley got a lot done in a really short life (check out our Shmoop Guide to Shelley for more on that). He wrote many kinds of poems, so in a sense, he has many calling cards. Still, there are also some big themes that carry through. A lot of his work focused on the poetic expression of big ideas and even bigger feelings. In many poems (like "Mont Blanc," "The Cloud," or "To Night"), his subjects come from the natural world. He doesn't just try to describe nature, though. What he really cares about is the way that our feelings and our ideas flow from and back into nature. So, if you're reading a poem that tackles the big issues of the connection between the human mind and the natural world, chances are good that you're dealing with Mr. Percy Bysshe Shelley.