So that's a matter of frame control. What's happening in those moments is your mind is shifting from active to passive. Visualize a wall. Deconstruct it brick by brick. Once it's gone let me.know
I tried it now, after 5 minutes I removed the upmost layer of the wall. not sure if i'm doing it wrong, but it feels a bit tedious first I had to decide how any bricks wide/tall is the wall. Then I had to add a ladder to the picture to climb up to the top, then I imagined some tool belt with tools to remove the cement/concrete in between the bricks. Then as I removed it I imagined some container on the floor for me to throw them into. Then I realized after removing 5 bricks I couldn't reach the next ones, so I had to climb down the ladder again to move it and up.
Am I doing it right? I'll try a bit more later, got 15 bricks removed. I also tend to narrate what I'm doing in my visualisations to keep my mind on track, not sure if that's beneficial or not.
I struggle with concentration and racing mind but can also hyperfocus and research intently on one topic for hours if I get into that. Diagnosed ADHD.