1. A capacitive proximity sensor, comprising: a skeletal-shaped sensor electrode structure comprising an overall cupped or box-top shape; a plurality of curved and straight conductive strips arranged as edges of a plurality of polygons, wherein the conductive strips connect the corners of the polygons, wherein the polygons lie in the surface of the overall cupped or box-top shape of the skeletal-shaped sensor electrode structure, and wherein the conductive strips define non-conductive openings within the polygons; a plurality of conductive diagonal strips arranged to cross through the non-conductive openings within the polygons and connect opposing corners of the polygons; wherein the capacitive proximity sensor is adapted for measuring an electrical field between the sensor electrode structure and an object.