I learned visualization techniques from my first T. I started by looking at myself in the mirror and telling myself to stop focusing on whatever I was dwelling on and focus on something more productive (mental distraction). When it wasn't quite enough to just do that. I would picture myself putting the ruminations in a box. Then sealing the boxes. Then a truck taking them to a warehouse. A couple years ago I dreamt that the warehouse was overrun by mice who feasted on my worries. Now, when I start worrying about stuff too much I picture a bunch of mice with forks and spoons. It makes me laugh.