i was thinking that the concept of the heart, as Kaien defines a heart, is one of the more eloquent concepts of Bleach. I was wondering if any of you could help me by recaling all the instances in Bleach when this topic has come up? The only instances I clearly remember are in Rukia's flashback when she's fighting the ninth espada and when Ulquiorra dies and is entrusted with a heart by Orihime (or he entrusts his heart to her? that's kind of confusing lol). Any help would be greatly appreciated. Thanks!