You think about it whilst you’re mowing the lawn. A couple things occur to you and you realize that actually the first idea you had was OK, but really it’s just part of a larger idea. That larger idea is something you haven’t ever considered. It seems pretty fresh. You ponder it some more, think of a couple nice analogies that help explain the concept.
Boredom, which is the enemy of technology, provides furtile soil for curiosity and imagination.