Matter-of-Fact Narrative in Magic Realism
In Magic Realist literature, the most fantastic, crazy things are told in a very matter-of-fact way. Your mom turned into a German shepherd? No biggie. Your wallpaper started talking to you? Happens everyday. Little fairies came to dress you for school this morning? We've all been there.
Think of it this way. If a writer wrote something like, "OMG! OMG! When I walked into the kitchen, my mom dropped on all fours and turned into a dog! I ran screaming from the room," you'd probably think, "Wow, that is so weird. That could never actually happen."
But how about this?: "My mom was making coffee this morning when she got on her knees, started barking and then turned into a dog. I continued eating my Cheerios." Here, the same thing is described as if it's the most normal thing in the world—and that makes the fantastic elements of the story feel more realistic, as if they could actually happen.
Chew on This
Here (Quote #3) is the narrator of One Hundred Years of Solitude describing a priest levitating in a very matter-of-fact tone of voice.
Check out Franz Kafka's deadpan first sentence (Quote #1) describing the transformation of Gregor Samsa into a bug in his story Metamorphosis.