Different Shapes of Havan Kunds

What if science and spirituality were never meant to be at odds—but rather two eyes that help us see reality in its entirety?
One eye—Science reveals the external world: the structure of atoms, the dance of galaxies, and the intricate laws of physics. It teaches us how things function, from the smallest quarks to the vast cosmos. The other eye—Spirituality unveils the internal world: the nature of consciousness, the mysteries of existence, and the rhythms of karma and dharma. It teaches us why things matter and how they shape our destiny.
Close one eye, and the world looks incomplete. Use both, and the truth comes alive.
Havan is one of the ten Vedic rituals (niyams - positive virtues) that are prescribed for a devotee who wishes to achieve oneness with the divine in ancient scriptures.
Havan is another way to conduct the Deva Yagnya, which is a primary Hindu ritual of worshipping the Gods. I.e. one of man’s five regular responsibilities, according to the Santana Dharma’s tenets.
In general, a Havan is conducted with the intention of achieving both material and spiritual success.
According to Indian scriptures, the human life runs on the philosophy of Yagya from birth to the end. In Indian culture, conceiving (garbhdhan) is also a kind of Yagya and so is the funeral (anteyeshti).
There are three root meanings of the word Yagya i.e. to worship (dev poojan), to harmonize (sangatikaran) and to bestow (daan karma).
As per the Panini Grammar, the root (dhatu) of the word Kund implies or means (1) protective place (rakshanarth Kund) (2) object of the measurement (manarth Kund) and (3) the opening place, nurturer, place of fire, pot for water (koshkaar Kund) etc. From the perspective of Yagya, it is taken as the place for fire of Hawan (Yagya).
Thus, Vedic literature describes Kund as a medium to offer havi (offerings) to the divine and the whole process, as the Yagya. This Vedic ritual Yagya includes very strict mathematical measurement for every part of the ritual.
The size of the Mandap is dependent on the size of the Kund and the size of the Kund is dependent on the number of offerings. The number of offerings is dependent on the spiritual penance (Dharm-anushthan) it was meant for.
In Bhavishya Purana; Kund Mandap Siddhi describes a total of 10 types of shapes
(1) Circular shaped / Vrittakaar Kund for peace,
(2) Semi-circular shaped / Ardhchandrakar for welfare,
(3) Vulvar shaped / Yoni Kund to get progeny (child) and to treat women's diseases,
(4) Trigonal shaped / Trayasra to win over enemies,
(5) Lotus shaped / Abaj Kund (Padma) to induce health, peace, wealth, positive outcome and rain,
(6) Square shaped /Chatursra Kund for everything good,
(7) Pentagonal shaped / Panchasra Kund for peace from enemey energies,
(8) Hexagonal shaped/ Shadasra Kund for defying enemies
(9) Heptogonal shaped / Saptakar Kund to treat psychological disorder
(10) Octogonal shaped / Ashtasra Kund to attain good health