"ordinal/digital"
By comparing the amplitudes of the piezo microphones under the four corners of the drawing surface, the approximate position of the pen on the drawing surface can be determined — theoretically, each microphone should give a higher reading as the pen scratches closer to it. However, because of the small surface, digital sampling error, and the rigid material which easily transmits vibrations to all microphones, the readings are very crude. These experiments start with a simple, predetermined shape, drawing it on the paper and recording amplitude information from each corner’s microphone. In the following iterations, the total original length is broken up into a series of small movements, each at 45-degree angles, toward or away from the corner that had the loudest sample at the corresponding moment of capture.
