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"OH WATERS, TEEM WITH MEDICINE TO KEEP MY BODY SAFE FROM HARM, SO THAT I MAY LONG SEE THE SUN." - Rig Veda
Psychologically, nigredo is a process of directing oneself to find self-knowledge. A problem is given full attention and reduced to its core. This is not done so much in an intellectual way, but especially by feeling the emotions. By really going into to it, one causes putrefaction, the decomposition of that in which one had been stuck. The confrontation with the inner reality is often painful, and can lead to depression. But once in the depth of the darkness, with the discovery of the seed of the problem, the seed in the ‘prima materia’, the white light is born (=albedo, whiteness, the next phase). A state of rest arises. Insight into the problem has been gained, it has been worked out emotionally, and knowledge arises on how to handle it in a more positive way and to build a more pure attitude.
The human brain is a trans-sonic plane, and the doctors studying it are engineers from 1900. They understand the the visible effects: push (a lot of random) button(s and weird glow-y panels that fill with changing words and may or may not be the result of the devil), receive thrust, and on some planes that are broken they've managed to tear off an engine and fiddle around inside it, but the avionics equipment, what with using semi-conductors and microprocessors, is basically black-box witchcraft to them, and the engines themselves are pretty much nonsense.
They recognize the basic idea of how the engines work; combustion of a hydrocarbon compound that isn't totally alien to them and is orders of magnitude more pure than anything they have outside of labs, much less in the quantities they need to run it for an extended period. The actual principles of the jet engine (compression from forced intake, fuel-air ratios, carefully tuned gear ratios and intelligent onboard systems in the engine itself to detect failures, damage and atmospheric conditions) are totally beyond them, and every engine they dismount to try to figure out stops working after two, maybe three, ignition runs since they're fueling it with total crap and have nothing hooked up to the diagnostic outputs and control inputs. Even the fucking landing gear is lightyears ahead of them; tires of vulcanized rubber, shocks based on pneumatic and hydraulic systems created through complex computer models to handle, y'know, a whole goddamn fucking plane bouncing off them. Even the goddamn metal itself that the plane is made of is alien to them, partly because aluminum was worth more than gold until some time in the late 1800's, and partly because the metallurgical techniques we use to create aircraft alloys, especially for trans-sonic planes, are utterly impossible given their level of technology.
So, to tie it all together: While the plane is in a running state, the engineers can't (from their perspective, with their tools and methods of figuring out how things work) touch a single damn thing that matters without everything breaking and flashing red. When the plane is disassembled and/or broken, they can't get anything working again and as far as they're concerned every single fundamental principle behind what we know to be how the plane operates istotally fucking impossible (remember that they hadn't even discovered heavier-than-air flight at this point. The wright brothers are still a ways off). Given a few decades or so, they'll eventually come to understand the principles behind some of the macro mechanical systems, and maybe even manage to mix up some fuel that will actually get the engine to do more than fail/explode, and at best even get an early start on powered flight in general. But actually replicating the plane itself is easily a generation or more out of their reach.