This is the prototype for the piece, so the environment for it is not as it will be when it's fully completed in January.
A monitor shows a video of a dog barking at you. It barks nonstop on a loop, until a viewer walks up to the microphone and barks into it. If they bark loud enough, the loop will stop, and the dog on the monitor will run away.
This project uses a SparkFun electret microphone breakout board, an Arduino, and Processing.