User blog:Shunsui Kyoraku/I've been drinking all night.

So anyways, I've been drinking for quite some time tonight and I decided to ask around anyones ideas on ichigo's zanpakuto. Not only is it in constant shikai, but it apparently floats on his back with restraint or constraint holding it in place. Pardon me if this is just a drunken observation, but does anyone know what holds his sword onto his back? This has been puzzling me for as long as I first saw it over 2 years ago. If anyone can fill me in on just what it is that will explain away the anomaly of his floating sword it would be greatly appreciated.