Spiritron



is the fundamental particle which makes up all things spiritual in the Bleach universe. Reishi is unique since it is invisible to mortals (such as humans with the exception of talented ones such as Quincy); it can however still interact with normal matter and produce physical effects as a indication of a spirit being; for example the infamous flying trick where ordinary matter is suspended from spiritual matter giving the appearance to a human that the object is flying (for example when Kon was abducted by a Hollow).

Reishi in the atmosphere is also able to be controlled freely, allowing a person to gather it under their feet so that they can stand in air.