In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Anchor
The anchor represents safety and security. If you dream of an anchor then you will be able to overcome all your problems, while if you throw one into the sea you will have success at work.