They are in common areas or on collaboration tables.
Chess used to be popular, but now its Go, a strategy game invented in China 2,500 years ago.
Anyone who walks by can play.
A note indicates if the next move is black or white.
It’s a bit weird, since you don’t know who you are playing against and you can move “stones” for either side.
Wikipedia says the game continues until “neither player wishes to make another move,” which sounds charming.
I don’t play. I watch the board to measure the flow of the day, watching as it starts empty and gradually fills up.