Upendra: "It is like the cloud in the clear sky. In the spiritual sky, the effulgence of Brahman is spread all round and the whole system is dazzling in spiritual light. The mahat-tattva is assembled in some corner of the that vast unlimited spiritual sky and the part which is thus covered by the mahat-tattva is called the material sky."
Prabhupāda: This is also very important. The sky is one. Just like we can experience the sky, and suppose the sky on San Francisco is overcast with cloud. We say that then we are covered in cloud. Practically this San Francisco sky is only a fragmental portion of the whole sky. Similarly, the real sky is that spiritual sky, paravyoma. When that paravyoma partially is clouded with mahat-tattva, that is called material world. This is the position of material world. Material world is also existing in the spiritual world, but it is covered and in a fragmental segment.