Japanese bow or yumi :

The weapons of warriors are considered impregnated by a spiritual power (kami) that makes it superior to the ordinary. The most important weapon of this spirituality is the bow. In the spiritual context, the bow is used to expelling  demons.

the different kind of bows :

   

The evolution of the japanese bow during the different japanese period :

   

Differentes shapes of japanese bow  :

the perfect size of bow to pratice with  :