The reason we could not find the AI’s was that the AI’s were not somewhere. They were everywhere.

Like River Tethys, the Grand Concourse flowed between military sized farcaster portals two hundred meters high. With wraparound, the effect was of an infinite main street, a hundred-kilometer torus of material delights. One could stand, as I did that morning, under the brilliant sun of Tau Ceti and look down the Concourse to the nighttime midway of Deneb Drei, alive with neon and holos, and catch a glimpse of the hundred-tiered Main Mall of Lusus, while knowing that beyond it lay the shadow-dappled boutiques of God’s Grove with its brick concourse and elevators to Treetops, the most expensive eatery in the Web. (Dan Simmons 1990.)

Songsworth: Tau Ceti Center