Arjuna tries to take in the form and cannot find its edges. Countless arms, countless bellies, countless mouths, countless eyes — stretching in every direction without limit. "I see no end of you, O Vishveshvara. No middle. No beginning." It is the experience of standing inside infinity and looking for a wall that does not exist.
When you stand at the edge of the sea, you can at least see the horizon — a line where water meets sky. But in the Vishwarupa, there is no horizon. Arjuna looks for a boundary — the point where the form starts, or the center around which it is organized, or the edge where it stops — and finds none. The form simply continues.
This is the first time Arjuna uses the word 'Vishvarupa' directly — the universal form. And he pairs it with 'Vishveshvara' — Lord of the universe. Both names acknowledge what is now beyond question: this is not a vision of a powerful being. It is a vision of everything that exists, held in one living form.