Watch the Sky
While writing I'm usually listening to music, sometimes there's a movie playing in the background. The movie has to be something I've seen a million times - lately it's been either Contact or While You Were Sleeping - or I'll pay too much attention.
If it hasn't been those movies, or some kind of music (like the Mr. Robot soundtrack), it's been this live stream of the International Space Station while it circles the planet. There's a sort of innocuous music playing over the video, which I usually mute. I can still get distracted by it, but usually if that happens I end up becoming very calm, very comfortable.