The material creation is a multi-verse that has billions of individual smaller universes that each exist deep within a larger universe that surrounds and encases the smaller universe. These massive outer larger universes are called a Brahmanda shell that all originate from the Body of Maha Vishnu

All the large almost spherical or egg shaped universes called Brahmandas, seen in first painting, all originate from the Bodily pores and breathing of Kāraṇodakaśāyī Vishnu, who is called Maha Vishnu.

In Gaudīya Vaishnavism three different forms of Vishnu are described that manifest in the material creation.

1 - Mahā Vishnu also known as Kāraṇodakaśāyī Vishnu.

2 - Garbhodakaśāyī Vishnu (Hiraņyagarbha).

3 - Ksirodakaśāyī Vishnu (Paramātmā).

Each Vishnu Form has a different role in the maintenance of the material universe and the jiva souls who have chosen to come to the temporary worlds.

Therefore for material creation, Lord Krishna's plenary expansion assumes these three Vishnus.

1 - The first, Mahā Viṣhṇu, creates the total material energy, known as the mahat-tattva, exhibited with billions of different massive universes called Brahmandas.

2 - The second, Garbhodakaśāyī Viṣhṇu, enters into each of those massive universal Brahmandas and creates, with the help of Lord Brahma who manifests on a lotus flower that grows from Garbhodakashayi Vishnu's navel, a secondary smaller universe that is deep inside each Brahmanda where each Brahma also builds many planetary systems, with 14 in ours.

All are different in size based on how many heads Brahma has, our Brahma has 4 heads, whereas other Brahma's in other material universes that exist deep within their Brahmanda, may have 10, 20, 100, 1000 or even a million heads.

3 - The third, Kṣīrodakaśāyī Vishnu, also called Paramātmā, is the all-pervading super soul, yet importantly simultaneously seen also as an "individual Person" who accompanies each "individual jiva" soul within their material bodies vessel's heart in all material bodily forms that are inside those smaller universes deep inside each Brahmanda.

Kṣīrodakaśāyī Vishnu, also called Paramātmā, is present even within the atoms.

The real objective of meditation is realizing that Paramātmā (Krishna in the form of Vishnu-tattva) is always with each jiva tattva. 

It must be understood that NEVER does the jiva-tattva become "one" with Paramātmā (Vishnu-tattva)

Such a belief that there is "one all pervading life force or consciousness" that only becomes an individual while housed or contained in a material bodily vessel, is called impersonalism or Mayavadi philosophy.

Anyone who realizes this understanding can be liberated from material entanglement.

Garbhodhakaśāyī Viṣhṇu is an expansion of Mahā Viṣhṇu who is an expansion of Saṃkarṣaṇa of second caturvyūha, whom expands from Nārāyaṇa in Vaikuṇṭhaloka.

Garbhodhakaśāyī Vishnu is realized as the form of Pradyumna within each of the  billions of inner material universes deep with each Brahmanda outer universal shell.

Garbhodhakaśāyī Vishnu is the father of Brahmā who appeared from His navel.

Garbhodakashayi Vishnu is in each of the billions of smaller universes  that are deep within their surrounding Brahmanda shells, and is also called Hiraņyagarbha.