One of the most intriguing parts of my job is coming to understand an invention with the inventor. By definition, the inventor has broken some new ground in their field of expertise and it is my job to extract the important features and define them in a way that makes sense to them, a person of ordinary skill in the art, as well as the patent examiner.
This exercise is one of the most enjoyable parts of the job when it goes well, and one of the most miserable when it does not.