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.
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.