Euclid's geometry silently assumes that at any point, directions are interchangeable (rotations act transitively). This note builds an axiom system, the Apex Plane, flat at two points yet where this assumption fails: no rotation exists there, one direction is distinguished, and lines terminate. Flatness and homogeneity of directions are shown to be independent properties. Written as a letter to Euclid on the geometry of the degenerate dot, which is the point at infinity made real.