2D space plane https://en.wikipedia.org/wiki/Plane_(geometry) Damion Dooley In mathematics, a plane is a flat, two-dimensional surface. A plane is the two-dimensional analogue of a point (zero dimensions), a line (one dimension) and three-dimensional space. Planes can arise as subspaces of some higher-dimensional space, as with the walls of a room, or they may enjoy an independent existence in their own right, as in the setting of Euclidean geometry." "When working exclusively in two-dimensional Euclidean space, the definite article is used, so, the plane refers to the whole space. requires discussion