How does Chaim Potok use imagery in The Promise?

In Chapter Two, Michael and Reuven watch the clouds and talk about what shapes they look like. Michael sees images from the previous night, such as the face of the old man. This leads to a conversation about the old man and losing the money. Michael feels bad and has blacked out the time between his breakdown and arriving at home. He comments that the old man is vile and reminds him of orthodox Jews with whom he goes to school.