The most common uses of the wipe effect is the "Invisible Wipe" where a camera follows a person into another room by tracking parallel to the actor. As the wall passes in front of the camera, the editor has the option of using a wipe to be able to choose any other matching take of the same scene. It is also commonly used in quick camera pans in action sequences, to make a cut invisible. Such wipes can be impossible to see in the finished film. A good example of this wipe can be seen in the movie Das Boot when director Wolfgang Petersen uses it to pan between two occupied U-boat pens, even though they had only one U-boat for filming.