there's no line variation, in show all lines are hand drawnWhat? The animators use Macromedia Flash 8 (vector software) to create the show. And in the process they use stroke to path (manually tapering nodes) to make editing easier and faster. (than importing to Illustrator, tapering lines, exporting to Flash CS6 and then back to Macromedia Flash then copying symbols between libraries) They also use it to quickly smooth out animation artifacts. The downside to that is the lines then vary in width in some places.