There is nothing beyond here that we can properly comprehend until we walk into its voids, which are rare.
The MAXes in the image are shown to be small, varied lights. The hole is the entrance to the inter-NA space, which is very clustered with NAs.
NAs themselves can not be directly visualized, their shape is too complex for human comprehension. They also completely blend in with the void that surrounds them.
Any sort of creature able to enter NA is either extremely powerful or helped by equally powerful technology, even Bongus is unable to fully comprehend NA, it is simply too massive.