Stare at a wall for 10 minutes to improve your focus and productivity

Staring at walls to improve focus and productivity

I came across a video by Simple Lucas describing a routine to improve focus and productivity. The routine was basically: Don't use any screens/entertainment when trying to focus on work. When you start to feel mentally drained, sit and stare at a wall for x minutes to recover focus. I've been trying it, and it's a very effective (but hard) routine.