Ur-Mother installation in the core systems. The central sphere is 134,000 kilometres in diameter, surrounded by 60 "spikes" reaching a length of 150,000 kilometres. The total mass has been estimated to little more than one Earth mass. The central sphere is not composed of any known form of matter. It is highly reflective but also partially transparent, revealing a concentric structure with 4,418 kilometer intervals. The spikes are carbon-silicon-boron whiskers with a complex internal and external structure; autonomous nanotechnological and possibly femtotechnological systems exist inside them and interfere with attempts to approach.
Image from The Mothers: Overview and History by Martin Highglade Paul Stevens, Landfall University Press 2349. Reprinted with permission.Original source the Balanced Mediator Clan.