These are genuine all wood yosegi
bookmarks. No two are exactly the same, and they have a different pattern on each side.
These
unique bookmarks are very thin, lightweight, sturdy and flexible. The photo shows three
different bookmarks that are typical of the patterns used.
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