Casse tête en metal de la série Cast Puzzle et de difficulté niveau 5 (sur une échelle de 6).
Description éditeur en anglais:
At first glance, this puzzle by Ken Walker of Rivermore,California doesn't seem un-lockable. The five pieces,however, can most certainly be taken apart. Putting them back together, however, is the whole new problem in itself. My suggestion for solving this puzzle would be to not apply too much pressure. solve it or not, the five pieces exude a kind of elegance, spiraling into a comfortable fit in the palm of your hand.
The key word is"spiral".