Basically, the structure fulfills its function as a "Shield World" perfectly. It protects the occupants of it and gives them a huge "world" to live in. Potentially, an entire new civilization could be constructed in a Dyson Sphere. After their arrival in the Forerunner-constructed Dyson Sphere, Dr. Halsey explains the structure. She labels it a Micro Dyson Sphere because it is in fact very small, or perceived to be small when viewed from normal space. Linda also describes it as being in the bottom of a large bowl.