The colon stump has been messaging the brain. It thinks there is still a connection with the digestive system, and it believes it has work to do. But it’s just a wee stump. No job. Retired. Maybe a little gas escapes that way, just for old time’s sake. But the ostomy has taken over.
If I lost a toe, I might perceive the toe. Similarly, the absent colon is calling from beyond.
There is “organ” music, and I hear “The phantom of the colon is there, inside my mind.”