In mathematics, specifically in topology, a surface is a two-dimensional topological manifold. The most familiar examples are those that arise as the boundaries of solid objects in ordinary three-dimensional Euclidean space R3 — for example, the surface of a ball. On the other hand, there are surfaces which can't be embedded in three-dimensional Euclidean space without introducing singularities or intersecting itself — these are the unorientable surfaces. To say that a surface is "t… (More on Surface)