While all good info, I think it may be simpler for the lay person to just take it to the extreme and imagine what the sun would look like as you approach the pole in the summer time. The closer you get, the farther towards the pole it "sets", until it just moves around the horizon in a complete circle when you're at the pole. That's how I explained it to my son when he was about 7 and he understood it -- I don't think I would have gotten far with any of the explanations above!