The Gesture Wall uses Electric Field Sensors to measure the position and movement of the user's hands and body in front of a projection screen; the projected video and musical timbres are changed accordingly. To start the experience, the performer steps onto a plate that has a harmless low-frequency (50 Khz), low-voltage (10 Volts) RF signal applied to it. This signal is then couples through the performer's shoes and is broadcast through their body to a set of four pickup antennas located on goosenecks around the perimeter of the screen. These signals change with the distance of the performer from the respective sensors (an LED mounted in each sensor glows with increasing intensity as the performer's body approaches). The sensor data is transferred to a PC running ROGUS, where it is analyzed for gestural characteristics. Before starting the experience, the user must calibrate out the coupling strength of their shoes and body mass, which vary considerably from person to person. This is accomplished by touching a reference pickup electrode, which adjusts the transmitted signal such that every participant radiates equally. A Fish sensor with linearizing log amplifiers is used for the sensing hardware, just as with the Sensor Chair. Hand-on-calibrator state is detected by breaking an IR beam directed across the calibrator surface.
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