Apologies for the blurry picture, the camera was on the wrong setting. [I wonder who fiddled with that?]
Anyway, I just wanted to mention that both my sons are logical thinkers. Numbers and sequences of numbers help in just about every situation:- first we do this and then we do that. It is by no means fool proof but a concrete message is far more effective than a lot of surplus words. There is something about expectations in black and white, or rather blue and white in this case, that helps smooth over many of their worries and concerns.
Of course a visual timer as an accompaniment also helps them understand that the end is near in sight, which in turn reduces their anxiety, which in turn makes them more capable of concentrating on the task at hand.