(4) Base Camp
Here’s a poem that isn’t particularly hard to get through. In fact, if we were just judging on difficulty of comprehending the meaning of the words on the page, this might be a 2. "Sonnet 18," though, gets a major bump because of the hours, days, or years you could spend trying to work out some of the issues it raises with regard to reality and fiction, immortality, and the general role of art. The issues couldn’t be meatier, so prepare for a serious encounter.