[aebtebeten]

I messed up. Upon referring to http://martin-gardner.org/MGSAindex.html , I've learned it was a Hofstadter column: https://www.scientificamerican.com/article/metamagical-thema... (paywalled)

Does http://www.math.rwth-aachen.de/~Martin.Schoenert/Cube-Lovers... provide enough information? (At least it gives you some better search terms.)

> "indeed it is not visually obvious that any progress at all is being made until the cube is almost solved."