I made a small digital clock program that I put on a small display.
It sat next to me while I worked, and I found the transitions from one time to another (like 1:01 -> 1:02) to be distracting. So I changed the transition to be a gradual fade and it helped.
Now that I think about it, I remember getting distracted years ago at a home with a grandfather clock. A quiet room except for the ticking. Definitely accentuated boredom (which with smartphones, we never have anymore)
Yeah, at work we switched phone systems a few years back to some Avaya phones. The new ones had a small screen on them. After 15-30 minute idle, they'd display the a logo that would jump to a new location every minute or two. It was a constant distraction in the corner of my vision. Ended up moving the phone to where I couldn't see it. About 10% of the workforce found it distracting.