I recently came across an article in Fast Company called Why Successful people have so many groups of friends. Not only was it a really interesting read, but there was also a really nice graphic by Dave Gray (founder of Xplane, and awesome with a pen!).
I figured that there were a couple of other key concepts that it would be great to include, and therefore created another drawing (trying to replicate Dave’s hand-drawn style!). Dave’s drawing is also included in this very short presentation.