The search for the Afikoman
As Bokonon has it (you can tell I liked the book!):
Tiger got to hunt,
Bird got to fly;
Man got to sit and wonder, "Why, why, why?"
Tiger got to sleep,
Bird got to land;
Man got to tell himself he understand.
Hide-and-seek is probably the most universally popular children's game. Just like a child's natural curiousity is exploited to keep her interested in the seder, so to does God play hide-and-seek with Reality, to keep Man ever interested in Him.