March For Our Lives protestors borrow a page from the 'Three Billboards' playbook

A seemingly endless variety of signs were on display at the March For Our Lives this weekend, but look closely and you may have noticed a few common trends emerging.

One is the bright red sign with bold black text, sometimes accompanied by others like it and usually calling out specific individuals or institutions for their inaction in the face of tragedy. Like so:

The origins of these billboards and Three Billboards