General Systems Bus

The General Systems Bus is a subregion of Five Pebbles. In this area, strange symbols (similar to karma symbols, and including some) move around in sync with each other, as if they were written on a rigid, transparent material moving independently to the game world. Roughly at the center of the biggest room in the General Systems Bus is a square room about the size of the screen that contains the region's iterator, the namesake Five Pebbles. When the player comes into this room, the iterator will give the slugcat the highest level of karma (an X symbol), and the mark of communication. This mark of communication is required to talk to Big Sister Moon, as well as the Echoes.

Trivia

 * The first Echo to speak with is found after leaving General Systems Bus and upon entering The Wall. This Echo will acknowledge the mark of communication, calling it an "unimaginable gift".