Miralles Lines, Curvature Analysis through Graphic Differential Geometry 1: Curve Identification. Plan Curves starting from left: the retaining wall, the enclosure wall, the paving/landscape division. Each curve possesses a different character in the negotiation of rate of change. Underlay courtesy of Carme Pinós.
Miralles Lines, Curvature Analysis through Graphic Differential Geometry 3: Tangent & Normal Notation. In order to find a common notation that can describe all three curves, a notation of lines tangent and normal to the curves is introduced. Each tangent vector describes the trajectory at an instant along the curve. Each normal vector is extended to the center of the circle that best approximates the radius of curvature at that instant.