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== Introduction ==
== Introduction ==
Indian texts offer a large number of principles and concepts regarding light and sound. Yogasutras present Nada, the primordial sound, as fundamental to the understanding of consciousness and the material world. Nada is conceptualized both as the physical vibration and a metaphysical essence for the origin of creation.
Light in Indian tradition is not merely physical illumination but enables perception and cognition. Indian concept of light just like sound, transcends simple optical physics, and encompasses both physical and metaphysical aspects. Epistemically light is that which both exists and reveals existence.
== Sources of Indian Optical and Acoustic Knowledge ==
* Siksha Granthas - They offer the foundational knowledge of sound production and articulation of words.
* Natyashastra - It elaborates on sophisticated theories of musical acoustics and harmony. Differences between musical instruments is dealt with.
* Nyaya and Vaiseshika Darshanas - They offer theories about human auditory cognition and describe how the propagation of sound occurs through air.
* Upanishads - These texts discuss the metaphysics of light and vibration.
Temple architecture embodies the very principles of resonance, illumination and even musical notes.
== Nature and Elemental Classification ==
== Nature and Elemental Classification ==