Umm... that's great for printed materials but how are you going to make that work on a white(black)board or for that matter with a pencil? Not sure I've done m

Umm... that's great for printed materials but how are you going to make that work on a white(black)board or for that matter with a pencil? Not sure I've done many directed graphs in print but I've done quite a few with a marker/pencil/chalk.