The subject of Flatland is based on the homonymous novel by Edwin A. Abbott, published at the end of the 18th century in Great Britain and that has not yet stopped to charm young and adult readers. It is the animated adventure of a curious square who, pushed by the questions of his grandson, learns to reason in more than two dimensions, discovering so the third one and dreaming the fourth one, an allegory of a better world. The nonconformist thought of the main character will be the cause of his imprisonment, in a world where a rigid hierarchical organisation based on the number of sides is in force, and where nonconformist thought is not admitted. Two are the main characteristics that make the documentary so interesting: Flatland proved to be mainly an extraordinary satire of conformity and cultural intolerance (think above all to the epoch when Abbott wrote his novel) on one side, it force us to get inside a bidimensional world on the other: how is a sphere seen by an inhabitant of this strange country? And what about straight lines? The view is worthy of the required imaginative effort.