I had the most vivid dream last night . I was sitting on the ledge of my balcony , looking over the city below , when my apartment gave a tremendous shudder and detached itself from the ground . I floated over Codice , looking down and seeing the people flowing through the streets , like ants . I fell from the balcony . 
Question: How could I tell it was a dream ?
Buildings do not simply detach themselves from the ground .