Tantra
The esoteric vehicle of the Hindu traditions. Where mainstream Hindu practice is devotional (bhakti) — a relationship with divine persons through prayer and temple worship — Tantra is initiatory and somatic. The subtle body (sūkṣma-śarīra) as the actual site of practice: seven chakras as nodes in the energy body from root to crown, the sushumna channel as the axis, Kundalini-shakti as the latent force awaiting awakening. Transmission from guru to initiated student is required; the practices are not public. Structurally parallel to Vajrayāna, Kabbalah, and Neidan — four independent esoteric systems that arrived at surprisingly convergent architectures.
Muladhara (mula = root, adhara = support) is the first chakra in the shat-chakra system mapped by the Sat-Cakra-Nirupana of Purnananda. Located at the base of the spine between the perineum and coccyx, it is the seat of the prithvi tattva (earth element), represented by a four-petaled lotus of crimson hue. Here Kundalini Shakti sleeps coiled three and a half times around the svayambhu-linga, awaiting the yogic practices — bandha, mudra, and pranayama — that will awaken her ascent through the sushumna nadi toward Sahasrara.
Svadhisthana (sva = self, adhisthana = dwelling place) is the second chakra in the shat-chakra system, associated with the apas tattva (water element). The Sat-Cakra-Nirupana describes it as a six-petaled vermilion lotus located at the sacral plexus, governing kama (desire), procreation, and rasa (aesthetic and vital fluid). Its bija mantra is VAM, its presiding deities Vishnu and Rakini. In the subtle body (sukshma sharira), Svadhisthana is where prana encounters the pull of creative and sensory experience — the seat that must be neither repressed nor indulged but channeled upward through vairagya (dispassion) and abhyasa (practice).
Manipura (mani = jewel, pura = city) is the third chakra, the 'city of jewels' located at the navel center (nabhi-sthana). The Sat-Cakra-Nirupana depicts it as a ten-petaled lotus of brilliant blue, associated with the agni tattva (fire element) and the bija mantra RAM. It governs tejas (radiance), iccha-shakti (willpower), and the digestive fire (jatharagni) that transforms food and experience alike. Its presiding deity is Rudra, and its challenge — articulated in the Yoga Sutras of Patanjali through the niyama of tapas — is the right governance of personal power: agency without ahamkara (ego-inflation).
Anahata (the 'unstruck') is the fourth chakra, located at the hridaya (heart center), where the anahata-nada — the primordial sound that resonates without any physical striking — is perceived by the advanced yogi. The Sat-Cakra-Nirupana describes it as a twelve-petaled lotus of deep red, governed by the vayu tattva (air element) with the bija mantra YAM. It is the seat of the jivatman (individual self) and the junction where the three lower chakras of pravritti (worldly engagement) meet the three upper chakras of nivritti (spiritual withdrawal). The Chandogya Upanishad's teaching of the dahara-vidya — the meditation on the tiny space within the heart that contains the entire cosmos — maps precisely to Anahata's function as the bridge between finite self and infinite Brahman.
Vishuddha (vishuddhi = purification) is the fifth chakra, located at the kantha (throat), associated with the akasha tattva (ether/space element) and the bija mantra HAM. The Sat-Cakra-Nirupana depicts it as a sixteen-petaled lotus of smoky purple, the seat of vak-siddhi (perfected speech). Its presiding deity is Sadashiva in the Ardhanarishvara form, signifying the union of expression and silence. In Nada Yoga, Vishuddha is where the sadhaka first apprehends the subtle sound-currents (nada) that descend from Sahasrara, and where satya-vachana (truthful speech) — one of the yamas in Patanjali's Ashtanga Yoga — finds its physiological and spiritual seat.
Ajna (ajna = command, authority) is the sixth chakra, the dvidal-padma (two-petaled lotus) located at the bhru-madhya (space between the eyebrows), the seat of the guru within. The Sat-Cakra-Nirupana identifies it with the manas tattva (mind element) and the bija mantra OM. Here Ida, Pingala, and Sushumna nadis converge in the triveni — the triple confluence — and the distinction between drashtr (seer) and drishya (seen) dissolves. Patanjali's Yoga Sutras (3.1–3) describe the progression of dharana, dhyana, and samadhi that culminates in Ajna's activation, granting prajna (transcendent insight) and viveka-khyati (discriminative awareness) beyond ordinary sensory cognition.
Sahasrara (sahasra = thousand, ara = petals) is the sahasra-dala-padma, the thousand-petaled lotus at the brahmarandhra (crown of the skull), described in the Sat-Cakra-Nirupana as the destination of Kundalini's ascent through the sushumna nadi. It transcends the tattva system entirely — it has no element, no bija mantra, no presiding deity in the ordinary sense, for here Shakti reunites with Shiva in the non-dual state the Mandukya Upanishad calls turiya (the fourth state beyond waking, dreaming, and deep sleep). This is the locus of nirvikalpa samadhi, where jivatman dissolves into Paramatman and the mahavakya 'Aham Brahmasmi' (I am Brahman) is no longer a proposition but a lived identity.