Flatland: The Movie is a short animated film which was released to video in 2007. The story is based on the 1884 science fiction novella Flatland: A Romance of Many Dimensions written by Edwin A. 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:_The_Movie