flexatube means A folded paper puzzle created by connecting the ends of a strip of four squares, each folded along 45-degree diagonals. The solver is challenged to turn the structure inside out using only foldings. Lexicurio rates it Sui generis — a strength score of 92 out of 100.
Etymology
From flexible tube.
noun
- A folded paper puzzle created by connecting the ends of a strip of four squares, each folded along 45-degree diagonals. The solver is challenged to turn the structure inside out using only foldings.“At least two other completely different methods of turning the flexatube inside out are known, and both are as devious and difficult to discover as this one.”