I'm really struggling to think of creative and abstract jobs that meet all of the following criteria:

1) Take place in a typical corporate setting--which is the context here, nobody's asking studio musicians to do stand-ups.

2) Have 0 artifacts of progress being made. Even brand design goes through iterations.

3) Are so abstract that it's impossible to distill your thought process into a small summary each day

If it's really impossible to summarize what you did all day, I'm going to question if you were actually doing anything at all.