One way to do this would be to buy (e.g) a bunch of white caps and tell your coworkers to wear them when they need to concentrate, and to not disturb others whe

One way to do this would be to buy (e.g) a bunch of white caps and tell your coworkers to wear them when they need to concentrate, and to not disturb others when they are wearing them. I know of at least one company that does this and it works well for them. You can also do this with headphones, just tell your coworkers politely.