Clearly some minds are wired differently than mine

I was looking for some tips on how to sum the error to add the I to my P.  (PID).  I came upon this video.  Why folks are worried about what parts he used to build it.  To me, it is the program that I cannot get my head around.  It looks like it is only capturing some of the 54 "color facets" that make up a Rubrics Cube.  It would seem to me you need each facet to solve the problem.  Interesting stuff!