The mere presence of a smartphone in a room - even if turned off and not your own - lets you focus and test significantly worse than if the smartphone was in different room. Out of sight, out of mind really does seem to be true as this University of Texas study found
If you work in a shared office space and want to avoid distracting co-workers stopping by for too long, put your workstations on a dark carpet. People will have the tendency not to step on the dark carpet and so naturally keep the desired distance.
“One does not accumulate but eliminate. It is not daily increase but daily decrease. The height of cultivation always runs to simplicity.”