Originally, Lady and the Tramp was planned to be filmed in a regular full frame aspect ratio. However, due to the growing interest of widescreen film among movie-goers, Disney decided to animate the film in CinemaScope making Lady and the Tramp the first animated feature filmed in the process. This new innovation presented additional problems for the animators: the expansion of space created more realism but gave fewer closeups. It also made it difficult for a single character to dominate the screen so that groups had to be spread out to keep the screen from appearing sparse. Longer takes become necessary since constant jump-cutting would seem too busy or annoying. Layout artists essentially had to reinvent their technique. Animators had to remember that they had to move their characters across a background instead of the background passing behind them. Yet the animators overcame these obstacles during the action scenes, such as Tramp killing the rat.