What choices does Dickens make when describing the meeting of Pip and Miss Havisham?

Dickens
makes the choice to go back and forth between the of the young Pip and the adult Pip in this
very famous scene.

The young Pip is filled with wonder at what seems like a
scene from a perverse fairytale and hardly knows what to make of it, while the adult Pip
provides a more detached commentary.

For example, we hear the voice of the
older Pip in the following, speaking of the dressing table. The second sentence, in which he
refers to the strangest lady he "shall ever see" is also the voice of the adult Pip:
the young Pip could not know how strange Miss Havisham is, though he realizes she is
odd:

Whether I should have made out this object so soon if
there had been no fine lady sitting at it, I cannot say. In an arm-chair, with an elbow resting
on the table and her head leaning on that hand, sat the strangest lady I have ever seen, or
shall ever see.

It is also the adult Pip describing in a
coherent way the various bridal objects scattered around the room. We know this, because he
tells us his memories are a compilation of more than what he took in in the first few moments in
the room as a child:

It was not in the first few moments
that I saw all these things, though I saw more of them in the first moments than might be
supposed.

Then, we return to what the young Pip
saw:

But I saw that everything within my view which ought
to be white, had been white long ago, and had lost its lustre and was faded and
yellow.

This layering of the two perspectives adds
richness and complexity to this scene.