What is Krishna's Universal Form in the Bhagavad Gita?

In Bhagavad Gita chapter 11, Arjuna asks Krishna directly: if you are truly what you claim, show me your universal form (11.3–4). Krishna warns that ordinary human eyes cannot perceive it, and grants Arjuna a "divine eye" (divya chakshu, 11.8) built for the purpose. What follows (11.9–11.31) is the vishvarupa darshan — Krishna revealing a form with countless mouths, eyes, arms, and faces, containing all the gods, all beings across the three worlds, and both the origin and the dissolution of the universe within it simultaneously. Arjuna sees warriors from both armies rushing into Krishna's blazing mouths and being destroyed — a vision of time itself as devourer, not just a display of grandeur. The sight overwhelms him: he trembles, his hair stands on end, and he asks, terrified, "Who are you in this terrible form?" (11.31). Krishna answers plainly: "I am time, the great destroyer of the world, and I have come to annihilate these people" (11.32) — the battle's outcome, he tells Arjuna, is already decided by cosmic necessity; Arjuna is merely the instrument. Shaken, Arjuna begs Krishna to withdraw the vision and return to his familiar, gentle four-armed form (11.45–46), which Krishna does. The chapter's real turn comes at its close (11.53–54): Krishna states that this form cannot be seen through study of scripture, austerity, charity, or ritual — only through single-minded bhakti, devotion, can one truly know and enter into him. The theophany's purpose, in other words, is not spectacle but to establish that awe alone doesn't produce relationship — devotion does.