It is important because this is what pulls everything all together. This is where the main character is introduced and the character that is telling him an important story is introduced as well
✡ If we have 3 boxes and 9 classes, you divide ✡
✡Therefore 3 classes can get a box. ✡
A short story conserves characters and scenes, typically by focusing on just one conflict, and drives towards a sudden, unexpected revelation. Go easy on the exposition and the backstory, your reader doesn't need to know everything that you know about your characters.
It is true that the expressionist described the world outside the character through the character's moods and impressions.
