This is a demonstration of the newer I2C/TWI Video Peggy firmware for the Peggy 2.0 display. Quartz Composer is sending its output serially to an Arduino. The Arduino then sends this via I2C to a Peggy 2.0 display. By doing this no modifications to the Peggy 2.0 are required, just three wires to connect to the Arduino.
More information (plus pictures/videos/code) at planetclegg.com/projects/Twi2Peggy.html