Rubik's Magnetic Cube prototype: polarities

Here's a little trick for figuring out the polarities on a complex set of interconnects like those required by this project. I don't know which is N and which is S, but I lined up the magnets in one long rod, and drew a black dot on one end, peeled that magnet off, drew another, and so on until every magnet had a black dot on what we'll call the negative side, not that it matters.

Done