Pull back and reveal,
is a technique of movement. The camera moves backwards revealing more information. It may be an object, character, or the backdrop.
is a camera composition technique placing characters at a distance from one another. It expands attention into the Z-direction, to or from the camera may subtly changes the composition of the frame without a cut.
is a camera composition technique with noticeable and unordinary angles. Generally, at a high or low angle of an unnatural point-of-view. Often used for effect, it also implies many messages to the audience, intended by the director or not.
The Camera Dolly, Reveal in Background is a technique introducing a new subject, generally from the left or right edge as the camera travels horizontally as the new subject appears in the background. The shift in focus is more subtle than the variation reveal in foreground. The separation of depth may go unnoticed by the audience and is most effective as subconscious messaging or a method of foreshadowing.