Something intriguing about the clock functionality and culture between chess and Go:
In chess, the clocks often do not have any countdown sound even when the time is about to run out. My understanding is that this is because having the clocks do a countdown would disturb the players’ concentration. Therefore the players are all trained to glance at the clock to check the remaining time while playing.
However, chess tournaments often have an audience sitting or standing at the back, which is an innate source of sound and distraction.
On the other hand, not only does the clock in Go do countdown, some clocks even have sound when you press the clock so that the player knows whether you pressed it or not. An orchestra of countdown is played when all the players are in byo-yomi. There was one professional tournament where they removed the countdown and many players lost by time.
However, in Go there’s no audience sitting at the back and the playing hall is mostly silent. Even the photographers are requested to leave the hall after 15 minutes, allowing the players to fully concentrate on the games.