Hi Shapeways fans, Spiral Burr 90x90x90 is a scaled-up version of the PuzzleMaster version. It is a six-piece burr of interlocking spirals. Next to sliding and rotation, spiraling is the third fundamental way of turning pieces in an interlocking puzzle. The spirals are notched. The object is putting the puzzle back together after turning it apart. Watch the YouTube video. Buy the puzzle at my Shapeways Shop. Read more at the Non-Twisty Puzzles Forum. Check out the photos below. Enjoy! Oskar