Explaining Game Design

One thing I've been struggling with recently is how to explain to my family & friends what exactly I do for a living, being a level designer is a very abstract concept to someone that doesn't know how games are made.

But after mediating on the subject, I think have to come to able to explain it by this simple principle that a designer in the game industry main responsibility is crafting the player's experience, whatever it's by balancing systems or building layouts.