Light consumes coal. Save light, save coal. United States Fuel Administration" poster
The pattern
This still is filed under Civilian war-duty equate.
Define
A civilian act (saving, making, staying quiet) is framed as the same duty as the front.
Mechanism
Moral equate. The small act inherits the gravity of the large one. The ask is ordinary. The meaning is not.
Verdict
We need mass compliance on an unglamorous behavior and can honestly tie it to a shared stake.
Why it works
The poster makes a stark logical connection between everyday electricity use and the war effort's need for coal. The prominent pull chain focuses the viewer on the exact physical action they must take.
Steal this when
You need to translate a large, abstract collective action goal into a concrete, immediate household habit.