That line from the father's song in Mary Poppins, where he's going on about how nothing can go wrong, in Britain in 1910. That's about the point I realized the boy was gonna die in a trench.
Philosophers, notably Popper, have also considered the relation between subjective knowledge (which he calls world 2), objective knowledge (world 1) and the knowledge represented by man-made artifacts (world 3).
I think the NSA and the DHA and the CIA have a job for you...
You'll make millions on book and movie deals, at the VERY least.