To open a spin box you must first spin it counterclockwise and then tip it
upward. Only then will the lid lift off. This box has become an American classic. To see
one of these box open click here.
A mechanical puzzle is a self-contained object, composed
of one or more parts, which involves a problem for one person to solve by manipulation
using logic, reasoning, insight, luck, and/or dexterity. - Jerry Slocum