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Jinzen is the only way to carry on a proper conversation with ones Zanpakutō. One places their sword over their lap and takes a meditative pose and then squeezes their heart into their blade. In this form one can call out the true form of the powers of their Zanpakutō. This form is something Soul Society has worked out over 1,000 years since its formation. It is entirely about speaking with one's sword.