How inscrutable and incomprehensible are the hidden works of Nature!
You can watch actors create their illusions, but if you don't see where they get the pigeons from, you don't really know how they're doing it.
The eye and brain are conspirators, and, like most conspiracies, theirs is negotiated behind closed doors, in the back room, outside of our awareness.
It's so hard to figure out what's going on in biological systems. You just can't see them.
The machine conceals the machinations.
To retain respect for sausages and laws, one must not watch them in the making.
Those that respect the law and love sausage should watch neither being made.
If choices and decisions derive from hidden mental processes, then free choice is either an illusion or, at minimum, more tightly constrained than previously considered.