Abstract: Electrographic sensor and method for position determination of a selected position thereon. Sensor includes a conductive material layer having electrical resistivity and a surface, at least three spaced apart contact points electrically interconnected with the layer, a processor connected to the contacts disposed to selectively apply a signal to each contact, and a probe assembly that includes either a stylus coupled to the processor with the stylus disposed to be positioned by a user in vicinity of the selected position on the layer, or a flexible layer with a user's finger selecting that position on the flexible layer to receive signals from the layer when the contact points have signals selectively applied. The selected position is determined by the processor from signals received from the stylus, or flexible layer, each in relation to a similar excitation of different pairs of the contacts. The conductive layer of either two or three dimensions including a closed three dimensional shape.