Sorry I am not able to explain it very well. If you were to look down from above grab the top and rotate the shape clockwise, keeping it up right then the right face would move more towards the front and the left face would shift backwards.
Let me try to explain it another way. If you were to keep the shape just as it is and move around it to the right and then take a picture of that view.
Do these explanations help?? I am not very good at describing graphics.