A simple game
It's been said that if you don't understand the principle of comparative advantage, then you aren't qualified to talk knowledgeably about human affairs -- you're one of those "simple, uneducated men" that university humanities departments tend to produce in vast quantities.
Fortunately there's a handy game you can play to get your head around the principle. Visit Desert Island Game and see how you can improve your diet by trade.
And in the meantime, I'm looking forward to someone posting a game designed to illustrate the flip side of comparative advantage: Ayn Rand's 'Pyramid-of-Ability Principle.'