a single image on the strip of film. When a series of frames are projected onto a screen in quick succession (currently 24 frames per second), an illusion of movement is created.

the size and shape of the image on the screen when projected.

the use of edges of the film to select and to compose what will be visible onscreen.

a freeze shot, which is achieved by printing a single frame many times in succession to give the illusion of a still photograph when projected.