Flatland (also released as Flatland: The Film and Flatland the film) is a 2007 computer-animated film based on the 1884 novella Flatland: A Romance of Many Dimensions by Edwin Abbott Abbott. Synopsis: A square inhabiting a two-dimensional world becomes enlightened to the existence of both lower and higher dimensional worlds.

References:
https://en.wikipedia.org/wiki/Flatland_(2007_film)