The Sound of Music abbey question

Toward the beginning when we see the interior of the abbey for the first time, there are two nuns kneeling on stairs in the atrium area (I don’t know what it’s called, sorry) in front of a wall. What is this area of stone pictures that they’re kneeling in front of?

here is a link to a description of the abbey convent and church
another site notes however that only the exterior shots were filmed there, the interiors were a hollywood set, but maybe the desicription of the frescoes and shrines will strike a cord

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