For a daily Agnihotra ( Balivaishva ) a small copper pot is used. The inverted pyramid shaped Agnihotra pot receives, generates, and decentralizes electrosphere ....Apart from the pyramid shape, some other special symmetric geometrical designs are also used according to the kind of energy fields and the cosmic currents required to be generated by the Yagna.
Yagna – means selfless sacrifice for notable purposes. Sacrificing of the ego , selfishsness and material attachments and adopting rational thinking, humane compassion and dedicated creativity for the welfare of all – is indeed the best Yagna which should be performed by all human beings.
There are two basic energy systems in the physical world : Heat and Sound . In performing Yagna, these two energies, namely the heat from the Yagna's fire and the sound of the Gayatri and other Mantras, are combined to achieve the desired physical, psychological and spiritual benefits.
The lofty ideals of Yagna preach performance of action without desire .
Yagna Bhavana ( Desire to perform Yagna) – The Vedics had loftier ideals behind performing of Yagna. They were performed to acquire wealth , progeny , health and glory . Apart from these, yagnas were also performed for social causes like social health, harvesting of bumper crop, optimum rainfall , progress , social wealth, well managed and strong government as well as for world peace.
...the various substance offered in Yagna... are principally wood in small pieces called samidhas , like Sandalwood , Agar and Tagar wood ( Aquilana Malacensis and Valeriana wallichii ), Deodar ( Cedrus libani ), Mango ( Mangifera Indica ), Dhak or Palash ( Butea monosperma ), Bilva (Aegle Marmelos), Pipal ( Ficus religiosa ), Bargad( Ficus bengalensis ), Shami ( Prosopis cineraria ) and Gular ( Ficus religiosa }; and various Havishya or Havan samagri such as odorifeous substances, substances with healthy constituents, sweet substances and medicinal herbs.
In very part of the world some type of ritual like Yagna was performed and are being performed even today.
Brahman sutras contain directions regarding Yagna for Brahmins .
Sama Veda is recited while performing a Yagna.
If we give away all our things in the Vajpeya Yagna (sacrifice), we will become Indra (king of Gods). The underlying meaning of this sutra is that if we sacrifice the idea of craving, of having ‘more and more’, we will in a different space. We will have the sensitivity to live and enjoy what we have.
In physical terms, Yagna is a process aimed at refinement of the subtle energy existing in matter with the help of thermal energy of the Mantras. The knowledge of philosophy and science of Yagna as essential for understanding and experimenting the science of spirituality as the knowledge of elementary physics is for material based sciences. The experiments of Yagna, when performed at a small scale in a day to day life are called – Havan or Agnihotra.