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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.

La Sagrada Familia. Antoni Gaudi. Barcelona, Spain. Gaudi started work on the project in 1883. Building still under construction. Estimated completion 2026.