I have been thinking about extending Forms into three or more dimensions for a few years now and have so far only inflicted my thoughts on the National Puzzlers' League and G4G participants. Sadly, it has become time to end this journal's readership's bliss and begin to bloviate here.
"Solid and Hypersolid Forms,"
Word Ways: Vol. 42
, Article 14.
Available at: https://digitalcommons.butler.edu/wordways/vol42/iss4/14