Nice - I love Feynman! Actually, QED was the big reason why I got interested in the question in the first place! I think that what he poses there is more of: 'there's no way for me to explain to you what this field is - since I can't formulate an analogy that you're familiar with, so I won't even try.' I love Feynman's sense of curiosity: it was absolutely divine and he's a personal hero of mine. One thing that I never understood about him though was the fact that whenever someone would pose the question of existence or why the laws exist, he would always shrug it off and say that he didn't understand and that there was no point in trying to understand it. It is what it is - we do the mathematics and take it as is. My take: I think that explaining it is possible, and I think it's a question that's definitely worthy of trying to answer. Even if we can't get there, the pursuit itself I would think would be a worthy cause!!