Digging deeper under surface of the paper, using mathematical morphology as my guide, I now “get” how it works with:
1D Real Numbers.
and my little video yesterday turned out to be about:
2D Complex Numbers
which I didn’t realize when I made it but now I do. [the “invisible to binary -1″ was the imaginary -1 ]
So, knowing that, I’m going to skip ahead to something harder: