I've seen this grid years ago and never got around to it.
Got a grid template and need to fill each square by importance of that artist/persons influence. so I rummaged some art folders of artists I admire and fill it up with the ones that inspire me the most. Guys with solid linework and painting I love looking at and a tv character/actor. Just followed my gut at the moment.
Then there was a big chunk left at the bottom and it just didn't feel right putting artists there at all anymore.
Art is probably in my mind most of the time so its on top of the grid. but its the people in my life that makes everyday meaningful and are my solid foundation.... and I always leave a lot of space open for more.