1. There is a story line, the arch of happenings. 2. There is a character arch. 3. Hero goes from this mundane and normal world to the special world where strange/dangerous/funny/whatever things happen. And in the end he maybe comes back to mundane world of normal people of rides to the special world of lonely (?) heroes. Could we call this story world arch? 4. Sometimes there is a "character arc of society" Or is it part of third arch? Or are character archs of individuals part of this collective arch? Or is it a double arch? Protagroup vs. antagroup? How many archs it takes to sail through a sea of stories?