1)Southwest zone is named as a combination of the shrungarshala of south and the rangshala of the west ,so it is very vital zone.It contains the strong earth element which enriches the life by stability-support and significance to the life.The divine seed of earth element is seeded in the southwest zone of the central brahmasthan by ritual of Vaastu Nabhi ;where the soul of earth element gets rooted in the format of house.When the auspicious stone is placed in the southwest zone ,it gets a divine connectivity to the central sun element-ruby rooted in the brahmasthan which contains the Vastu Nabhi -soul of earth element.When the zones are connected to the Brahmsthan,they automatically receive the power-energy-strength through the supply of brahmand-lahari =the essence of Prana. To conform this sacred relationship with brahma ,the ritual of ratnadhyay has immense importance.
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🌺SahasraMahavaastu 🌺Shikhi:The deity "Shikhi " lies in the top corner of NorthEast zone and represents the Shiva-Chakra ;acts as the Corona or crown chakra of the Vaastu Purusha . It's form is like a flame a Jyoti and acts as the purifier of the whole Vaastu Purusha Mandala.Corona is more charged than the heart of the Sun ; likewise this Shikhi acts as the powerful source of cosmic energy and more powerful than the Brahmsthanam;as it acts as the passage for the outer orbit of macrocosm to the inner orbit of the 45 deities .Basically it activate the divinity in the womb of Water element viz Aap- AapVatsa Deities ;next to Shikhi.This Water due to continuous perpetual sanskara of Divine Fire enters in the divine orbit and becomes the "Teertha" , that removes all The negativities.In some systems this place is assigned to Lord Shiva viz Isha- deity.
One more mythological meaning is connected to the root word of the Shikhi ;which is Shikha.Shikha is considered as