The Set Up in "The Secret Life of Walter Middy"

The set up in "The Secret Life of Walter Middy" is different than what normal text is. Why is there different writing than usual? There is day dreams and normal text. The story starts with a day dream. He is a brave, smart Commander doing through the ocean. Some reasons he is brave is because it says, " The old man will get us through," they said to one another."Then it goes to Mrs. Middy saying, "Not so fast! You're driving to fast! "said Mrs. Middy." What are you driving so fast for?"" Then it goes on to "It's the millionaire banker, Wellington McMillan." And it goes on to reality and back to the day dreams again and again. The punctuation that separates the day dreams to reality is the ELIPSE ( ... ).