Most of my ideas for writing arise from a single point inside my mind. All I have to do is focus on that point, and an idea for a text pops out. Like magic.
However, there are times when it doesn't work, and then it's good to have an alternative. Merger mystery is such an exercise. It might not be as magical as one point consciousness, but it takes your craftsmanship of writing to a higher level.
It's an exercise that's mental in nature, which means it belongs to the Fire element, and it requires analytical strength combined with creative writing skills. You can compare it to the method of lateral thinking in design.