The "divine" perception

Usual human "eyes" can't perceive the air. If they are able to see the air, they will not be able to see anything else as the "air" acts as a screen between the eyes and the object to be seen. None of the human perception can perceive "space".

But Arjuna wants to see the "vibhutis" of the LORD who is in the space within an atom and at the same time who supports the whole of this Brahmanda (The Multiverse)

Lord is subtler than time (time can be infinitesimally divided into "moments" so Lord is shorter than the shortest moment anyone can perceive) and bigger than the space (space supports and pervades all the objects including the galaxies and lokas - universes).

So,
Lord Says:
इहैकस्थं जगत्कृत्स्नं पश्याद्य सचराचरम्।
मम देहे गुडाकेश यच्चान्यद्द्रष्टुमिच्छसि।।11.7।।
11.7 इह in this, एकस्थम् centred in one, जगत् the universe, कृत्स्नम् whole, पश्य behold, अद्य now, सचराचरम् with the moving and the unmoving, मम My, देहे in body, गुडाकेश O Gudakesa, यत् whatever, च and, अन्यत् other, द्रष्टुम् to see, इच्छसि (thou) desirest.

न तु मां शक्यसे द्रष्टुमनेनैव स्वचक्षुषा।
दिव्यं ददामि ते चक्षुः पश्य मे योगमैश्वरम्।।11.8।।
11.8 न not, तु but, माम् Me, शक्यसे (thou) canst, द्रष्टुम् to see, अनेन with this, एव even, स्वचक्षुषा with own eyes, दिव्यम् divine, ददामि (I) give, ते (to) thee, चक्षुः the eye, पश्य behold, मे My, योगम् Yoga, ऐश्वरम् lordly.

A yogiswara GURU alone can bestow such "divine" perception to have a glimpse of "Viswa Rupa" - the universal imperishable form. That Universal form is all encompassing all the spaces and all times (past, present and future) as well as transcends space and time.

om tat sat

Note: This is no trick like curing a disease, getting some object from nowhere, or creating and illusory vision like a magician creates it etc.,

The "Viswa Rupa" darsana is a deep and profound vision of LORD by his own grace of divine internal perception.