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Technically, no. Most novels use them, but I've read some Discworld novels that just have a black line occasionally to break things up. You may also wish to consider writing an epistolary novel, wh...
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Technically, no. Most novels use them, but I've read some _Discworld_ novels that just have a black line occasionally to break things up. You may also wish to consider writing an epistolary novel, which is a series of fictional documents such as letters (e.g. _The Color Purple_) or diary entries (e.g. _Flowers for Algernon_). That gives an arguably more natural, or at least human, division. By the way, those two books are great examples of how to really make this technique work, if you want to learn it; I once wrote an essay comparing them just on that.