Viśvarūpa — The Boundless Cosmic Form of Bhagavān
Viśvarūpa ('the one whose form is the universe'; viśva = universe, all, everything + rūpa = form, body) is the awesome universal form that Bhagavān Śrīman Nārāyaṇa revealed to Arjuna on the battlefield of Kurukṣetra, narrated in Bhagavad-gītā Chapter 11 (Viśvarūpa Darśana Yoga — 'The Yoga of Beholding the Universal Form'). Arjuna, having heard the entire Vibhūti Yoga (Chapter 10) wherein Bhagavān declared His infinite glories, requested to behold that cosmic reality with his own eyes. Bhagavān granted him divya-cakṣus (divine sight) — the ability to see what ordinary human eyes cannot perceive — and then revealed the Viśvarūpa.
The description in the Gītā is among the most overwhelming passages in all of Sanskrit literature. The Viśvarūpa contains within it: all the gods (devas), all the ṛṣis, all living beings, the sun and moon, fire, all directions, and the entire triple universe. It has innumerable mouths, eyes, arms, and forms; innumerable ornaments and uplifted weapons. It blazes like a thousand suns rising simultaneously (sahasra-sūrya-sama-bhāsa). It is boundless (ananta), without beginning or end, without middle. Arjuna, overwhelmed with awe and terror (bhayam), begs Bhagavān to return to His gentle four-armed form (caturbhuja-rūpa). Bhagavān graciously does so — revealing that the saumya (gentle) form of Nārāyaṇa is not lesser than the Viśvarūpa, but is that very same boundless reality clothed in grace and accessibility.
The theological significance of the Viśvarūpa in Viśiṣṭādvaita is profound. Rāmānuja's Gītā Bhāṣya teaches that the Viśvarūpa reveals Bhagavān's aiśvarya (sovereign lordship) — His absolute governance over all existence. The universe is not separate from Bhagavān but constitutes His śarīra (body); the Viśvarūpa is the direct vision of this śarīra-śarīri ('body-soul') relationship, wherein the entirety of cit (conscious beings) and acit (insentient matter) is seen as pervaded, governed, and constituted by Bhagavān as their inner soul (antaryāmin). The Viśvarūpa is thus the experiential confirmation of śarīrātmā bhāva — the fundamental ontological claim of Viśiṣṭādvaita.
The Āzhvārs were captivated by the Viśvarūpa across their pāsurams. Tirumazhisai Āzhvār in Nānmugan Tiruvandādi and Tirumangai Āzhvār in Periya Tirumozhi sing of beholding Bhagavān as the all-pervading cosmic reality, as the one who stands as the universe itself. Nammāzhvār in the Tiruvāymozhi speaks of Bhagavān as māyam ('the wondrous one') — whose true nature overwhelms all conceptual categories, who yet descends graciously to be worshipped in arcā (the icon form) for the sake of the helpless devotee. The Viśvarūpa is also called Virāṭ rūpa — the 'Immense Form' — in the Vedic cosmological literature (particularly the Puruṣa Sūkta, Ṛgveda 10.90), where the cosmic Puruṣa is described as extending beyond the universe in all ten directions.