Something inexpressible cannot be expressed by definition. But the beauty lies in the effort to let the experience manifest in whatever way possible.
One could pen down his thoughts, pondering over the true meaning of everything going through his mind. Longing for more. Questioning the actuality of his encounter.
Someone may initiate the formalization of his thoughts about his experience. To let another fellow seeker have the experience they experienced.
And a few could be absolutely silent and still or singing & dancing their heart out.
All the poems penned, Dramas written, Songs composed, Idols sculpted, Festivals celebrated ... etc are elaborate impressions of the beyond on this plane.
Even if it's just a glance, a significant vision, or an untethered shower of the beyond, Truly blessed are the beings that experience Brahman consciously.