If you closed your eyes and listened to this poem being read aloud, you could almost imagine that it's not a poem at all. The meter and rhyme scheme are very regular (check out the "Form and Meter" section if you don't believe us), but Morris doesn't bang us over the head with the poem's rhythm. It sounds more like natural speech than anything else. Sentences often continue after the end of a line (which is called "enjambment"), and sometimes sentences even continue after the end of a stanza. This gives the impression of a speaker whose words are tumbling out of her mouth without a lot of reflection. Guenevere is just saying whatever comes into her head, and a lot of it is just a jumble of memories and beautiful (though confusing) images.