Sometimes, in the midst of the workday, you just need a minute. Not a two-hour lunch, not an off-site appointment, just five minutes to take your eyes off your computer and projects and do something that accesses a different part of your brain.
Then, might I suggest building a mini-skeeball game to keep off to the side for occassions such as these? Assembled from a bit of corrugated cardboard, a recycled coffee cup, and hot glue, it’s built to use 1/3″ ball bearings, making the project around 1/9th scale. Instructable-r Fungus Amungus even provides a pattern so you can easily make your own over your lunch break.