I would start with a game: For any number, I can name a bigger number. For any collection with a certain number of things (such as n potatoes), I can always na

I would start with a game: For any number, I can name a bigger number. For any collection with a certain number of things (such as n potatoes), I can always name a collection with more things, such as n+1 potatoes. "Infinity" is a word that we use for games like that.