“Flatland: A Romance of Many Dimensions” is a novella by Edwin Abbott, published in 1884. The story describes a two-dimensional world occupied by geometric polygons. A square dreams about a visit to a one-dimensional world (Lineland) inhabited by “lustrous points”.
A big topic and an interesting one! Everyone is concerned (or should be!) about what data is out there online, who controls it, and what it is used for. So, what data is out there about you? Between all the social networks, email providers, blog sites, forums, and more. No one really has a clue.