March for Our Lives, a gun control advocacy group formed in the wake of the Marjory Stoneman Douglas High School shooting last year, put up an art installation Tuesday behind the Capitol to protest lack of action on gun violence. 

"Come out to our art activation today behind the Capitol building, open til 5 PM," the group tweeted. 

According to tweets from activists, the art "activation" featured a message that read "Your Complacency Kills Us."

It also appeared to include religious symbols meant to look like gravestones with roles and titles like "student," "boyfriend" and "coach." They were placed in the shape of a heart. Activist Matt Deitsch tweeted that the group used titles rather than names so "everyone could connect" with them. 

In the center of the heart the activists placed a figure that looks like a student wearing a sweatshirt that says, "Am I next?" There appeared to be a mirror where the student's face should be, so that viewers would see themselves.  

Gun control advocacy group Giffords praised the installation as "powerful." The group tweeted, "It’s time for the Senate to pass background checks."

The Hill has reached out to March for Our Lives for comment. 

Last year, 14 people, including students and teachers, were killed in a shooting at the school in Parkland, Fla.