Sacsayhuaman Stone Work - Logic?

These megalithic stone works manifest an alien psychology, it seems to me.

The method of construction just doesn't make sense to our minds.

Take the stonework shown in this Youtube vid:

"https://www.youtube.com/watch?v=lfVhiUkBTjU"

Take for example the pic shown at 5:35

Great enormous stones - and relatively tiny stones.

To our minds like field stone work, isn't it?  You pick up what you find and build with it.

But such fieldstone work is undressed.  Or minimally dressed.

These stones are ALL dressed. On ALL sides.  Even the facing side is not as nature made it else it wouldn't have the rounded edges they all have.

And they fit like field stone never fits.  Are dressed to fit. 

So two stones present an angle of say 85° like the two stones on the bottom row right in the centre of that picture at 5:35.  The monster and the little one to the left of it.

Now you find in the field a stone that has two sides with exactly that angle between them? That will fit snugly and perfectly?  I don't think so.  You have to make something to fit.

And how perfect is your making?  Can I see a slight bend in that vertical join between the monster and the stone to it's left?  I think so.  That's nothing less than astounding.  To manufacture two identical curves.

So then we get to the top of that left hand stone and the top is narrower than the base.  There's an angle cut out of it on the left.  Perhaps it was 'found' like that.

So then we hunt around to find a stone that will fit and we find one with a side very nearly the same length, just a bit longer.  So then we cut out a notch on the monster to fit the extra length!

We don't trim the side of the new stone where it could have been trimmed vertical.  No. We cut out a notch.  And fit the rock in.

So now, because we didn't trim up vertical, we've got a 'V' angle up at the top.  So what do we do?  Ah...  we just scout around and find a rock that's got exactly the same angle.  Or near enough.  And we trim it to fit.  Exactly.  Precisely. 

And it keeps going like that.  Everywhere you look.  Extra work.  No simple coherent design philosophy, not in the construction nor the shaping.

It defies our logic.

And commentators speak of plasticity.  Of the possibility that those stones were somehow made more or less fluid at some time.  I can't see that.  If you have a malleable, fluid, plastic material you'd  lay them down like laying to pillows or sandbags.   there's nothing like that here.  It doesn't suggest that kind of thing.

The structure has a definite upstanding, vertical essence to it, to my mind.