“Snake-cube puzzle.” The upper part of the image is a “snake.” The 27 blocks are connected by a single elastic that runs throughout, so each block will rotate on just one axis relative to its neighbors. 3×3×3 = 27, you observe? Yes, with a bit of twisting the snake can be twisted into a *solid* cube with 3 blocks on each edge.
Retired economics professor (“dismal scientist”). Married 40+ years to the love of my life; we have two grown daughters, both married, two granddaughters and a...
@angievega Thanks, Angie! The last one — tomorrow's post? — I still haven't solved! The solution is in a coffee table drawer (in an envelope), but I haven't looked yet. I mean how hard can it be?
It is definitely a neat design, and this one looks easy but the more you look at the finished cube, I can see where it would be more of a challenge than it looks.