
An alarm clock seems a highly relevant object to be depicting here – alarm and a sense of urgency is precisely what is needed to drive action, and you do not allow an alarm clock to keep on ringing once it goes off – you act.
In my first drawing of the clock, I considered what time to show on the face. It immediately occurred that in depicting an analogue clock face, I could show the doomsday clock as it stands in 2019 (at two minutes to midnight https://thebulletin.org/doomsday-clock/current-time/ )

The first graphic depiction of the doomsday clock by Martyl Langsdorf 
Later, a physical clock with a globe background was used by the Atomic Scientists Bulletin to demonstrate the changes in time


