Turning a corner in a dream symbolizes changing direction in life. If you dream that you turn a corner, you could be ending one phase of your life and beginning another.
A dream that you turn a corner can mean that you are looking at things from a new perspective (from a different direction.)
If you dream that you arrive at a corner and are not sure which direction to take, you have a decision to make in real life and are not sure of how to make the correct choice.
Turning left when you come to a corner can mean that you should use logic to make a decision, while turning right can mean that you should rely on intuition.
If you come to a corner in a dream, and then go back the way you came, you feel that you are not prepared for a change.