Mosaic works through signals similar, but distinct from those of a radio. It is through these signals that Origin can give orders to his army. Its power source is an Ethereal, more specifically, their mind control ability spread through out an entire army.
Every Outsider is equipped with a cybernetic device implanted inside the back of the head in order to receive orders.
While connected to the network, the subject is no more than a slave. Their heads are filled with ideas of fanaticism and complete allegiance to Origin and Mosaic.
When disconnected, subjects regain their former individuality slowly, and aggression seems to lower. As seen by the Infiltrator.