The Kumiki Helicopter shape brain teaser wooden puzzle contains 21 non-identical pieces that designed to resemble an Helicopter.
In Japanese the word kumiki means "joining wood together" and refers to varieties of wood craft.
In the puzzling world it refers to 3D interlocking wood puzzle that resembled a familiar shape like buildings, vehicles and animals, not just abstract shapes like spheres and cubes.
The object of this puzzle is to take it apart and then put it back together to form the original helicopter shape.
Tsunetaro Yamanaka (1874-1954) from Japan was the first craftsman to develop the figurative wooden interlocking puzzles known as kumiki.