I believe in multiple arcs in stories. When doing a story with round characters, one arc is the minimum for a character. This title may be a reference to math, but believe me stories are anything, but mathematical. It was just a cute way of asking whether you wanted to build all arcs from the bottom.
Sin 0=0. You know the curve (it does not apply to most stories) but stories change and only authors know where arcs end. They surely do not end at the same place… mostly. However if a story has multiple arcs, this title becomes very important. For example one arc is a previously ruined romantic relationship and the main arc has the protagonist stepping up as a hero. Now, you may well want to show the relationship for starting at ground zero, however you have limited time and space your story may not be about that relationship. Here you will be dealing with backstory.
It all depends on the author. If stories’ character and relationship arcs were to be put on a single graph you would have some weird form of modern art. It would look just like a jungle of ups and downs. However if two of these points are dealt with in a story and their difference is great…well we have a new ball game. Say arc A and arc B are both developing, but arc B is rising and arc A s dropping. Here you have some serious internal and external conflict going on. Dramatic kaboom!
When those lines meet. Man get ready for some hard hitting stuff. To most people reading this, what I am saying may not make sense, but that is since I am vague and I am only trying to ramble my journey. Stories can not be put into boxes. That is a lie we tell ourselves to keep us safe. Many authors have a formula and one arc and it works for them. All these terminology are just made up as well.
Maybe I am imagining another dimension, but hey… this is fiction.
Keep on writing, dreaming and plotting. Next up I will discuss the spine of a story. Do not worry…. it won’t be vague like this.