The audio commentary for the story Just includes a brief trip to the past. When I was in college, I took a class on medieval literature and we studied morality plays. At the end of the semester, I re-worked a script of Mankind and we performed it live. (Oh good, Dr. Koster still has a link to the script here.) Working on Mankind was a very different experience for me as a writer — the demons in the play get the audience to participate in a dirty song with them and the audience helps shape the outcome of the play. In today’s performances, such audience participation is frowned upon. But working with that concept – of the audience determining the outcome — made me want to try that in my own writing.
I was also a huge fan of those choose your own adventure books when I was younger, (seriously, who wasn’t?) even though most of the choices I made caused the death of the protagonist. Oh well.