[Again checks the database, again with the robotic voice.] The data says that the barrier appears to reach indefinitely into the sky and into the ground, it seems to be oval shaped and to reach the edges takes around two or three days depending on the direction. [A pause.] There's no data about the composition of the barrier but attempts to destroy or damage it have been to no avail.

[Stops the checking.] I suppose that's normal, if they want to experiment with synthesized shifting in a contained area they will need a container that can't be destroyed easily in one of the shifts. However it seems there was a time when the barrier was smaller, though so far the size is fixed that means that even if it can't be destroyed it can change its size.