“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”.
I was approached recently by a client wanting a 3D game environment in which players could talk to “bots” (artificially intelligent chat bots) by typing text and receiving replies. The chat bots were to live on a server while players would launch a 3D game client to login to the server.