This might sound silly: I used post-it notes as human-blinders.

I turnt the post-it note sideways, wrote `FOCUS TIME`, and put it on my temple, to block out my vision in that direction.

I joked about it with my team before, and then just did so when I felt comfortable enough with them. I utilize this strategy at home for deep focus in a chaotic living room setup.

2x Post-its, baseball cap, and over-the-ears noise-cancelling headphones is peak `focus-time` I've found.