Focus
Close your Facebook, Twitter, Slack, Skype, Mail, and anything else that might produce an interruption.
Put your phone on do not disturb mode. Put your computer on do not disturb mode.
If you can work without Internet, shut down your connection. If you don’t need it, it will just produce interruptions.
Put on your headphones. Even if you don’t want to listen to music, you can use them to show other people that you can’t hear them.
Only then can really focus.
Only then you can achieve flow.
Mihaly Csikszentmihalyi’s famous TED talk: Flow, the secret to happiness