So is a semi-transparent verse that seperates Nots into clusters. They can hold 10 to 1000 Nots, They're called "So" because it's the opposite of "Not" like "Always" is the opposite of "Never". Our local So holds 374 Nots. They're made of a special glass that's physically indestructible so that the Nots don't break out and get knocked out of the cluster. The only way to escape So is with teleportation, which requires extremely advanced technology or the power as a cosmic entity.