Can't help thinking of Simone d'Ardenne's reminiscence, where she said to Tolkien: `You broke the veil, didn't you, and passed through?' and she adds that he `readily admitted' having done so."
It seems she was referring to language, but Tolkien may have understood her question differently. 'Breaking the veil' seems like an apt title for the painting I linked to. Tolkien, one could say, 'broke the veil' & showed us what lies beyond - or at least gave us a glimpse of it. There is an awesome realm beyond, & our own smallness is revealed to us by what we are shown. Yet, as Lewis states, it is not a place that is forever denied to us - we are given that glimpse because whatever it is that lies beyond is somewhere we have a right to be - if I understand him. The original glimpse is brief - we may even miss it, but if we are open to what we see the next glimpse may be longer & clearer.
Managed to find a better pic of the painting ('Breaking the Veil' as I shall call it from now on) Hope it works