Why is the Kalash considered auspicious

Varuna and Agni are considered witness deities. Varuna's symbol is the Kumbh. Seeing the Kumbh reminds one of the story of the churning of the ocean. Seeing the Kumbh reminds one of the story of the distribution of nectar between the gods and demons by the Mohini avatar. The childhood pranks of Lord Krishna are associated with the pitcher. Seeing the Kalash brings to mind a temple.

In the scriptures, seeing the Kalash is considered equivalent to seeing a deity. The verses recited and the sentiments expressed during the Kalash installation make it clear why the Kalash is auspicious. During the installation and worship of the Kalash, a learned Brahmin touches its various parts and says something like this:

Lord Viṣṇu is seated at the mouth of the urn and Lord Rudra at the neck.  Brahmā is situated at the root of the tree and the mothers are situated in the middle of it

 In his abdomen are the seven oceans and the seven islands of the earth

 The Rig Veda, the Yajur Veda and the Samaveda are the Atharva Vedas.

 All of them, along with their limbs, were placed in the urn.

 In the middle of the ocean in the conversation between the gods and the demons

 Then the waterpot was lifted up and established by Brahma

 Sri Vishnu is seated in the mouth of the urn;  Rudra resides in the throat.  Brahya is situated at the root.  In the middle are the mothers.  In the womb (of the urn) is situated the water of the seven seas of the earth.  The Rig Veda, Yajur Veda, Sama Veda and Atharva Veda sit in the urn with their limbs.  The urn was removed from the middle of the ocean during the churning of the ocean, which was the struggle of the gods and demons, which was established by Brahma.