Nearly a decade has slipped away since the challenge of constructing a three-dimensional word cube of the sixth order first frustrated logophiles at large. I recall my first attempt to conquer this problem, shortly after its publication in Dmitri A. Borgmann's book Beyond Language (Scribner's, 1967). The task (which appeared as Problem 61, Three-Dimensional Thinking) was among the hardest in the book. After taxing sessions of headscratch and eyestrain, I arrived at the following semisolution.
Word Ways: Vol. 9
, Article 2.
Available at: http://digitalcommons.butler.edu/wordways/vol9/iss1/2