Binary Burr

Designed by Bill Cutler and made by Jerry McFarland 2003, level 85.
(Cherry / Walnut, 21 Pieces, 3 by 3 by 3.6 inches)

The Binary Burr functions like the Chinese Rings puzzle:

There are six "ring" pieces that must be manipulated in order to remove the "bar" piece; the remaining 14 pieces don't move and form the "cage' that constrains the movements. It basically takes two moves for each move of the corresponding Chinese Rings puzzle.