<P> In a dialogue scene between two characters, a straight line can be imagined running between the two characters, and extending to infinity . If the camera remains on one side of this line, the spatial relationship between the two characters will be consistent from shot to shot, even if one of the characters is not on screen . Shifting to the other side of the characters on a cut will reverse the order of the characters from left to right and may disorient the audience . </P> <P> The rule also applies to the movement of a character as the "line" created by the path of the character . For example, if a character is walking in a leftward direction and is to be picked up by another camera, the character must exit the first shot on frame left and enter the next shot frame right . </P> <P> A jump cut can be used to denote time . If a character leaves the frame on the left side and enters the frame on the left in a different location, it can give the illusion of an extended amount of time passing . </P> <P> Another example could be a car chase: If a vehicle leaves the right side of the frame in one shot, it should enter from the left side of the frame in the next shot . Leaving from the right and entering from the right creates a similar sense of disorientation as in the dialogue example . </P>

Who is credited with developing the 180 degree rule