For Avaaz activists, the shoes were an important way to advocate for gun control.
Gun violence has claimed the lives of 7,000 children in the years since the 2012 Sandy Hook Elementary School shooting, which left 26 people dead.
"Before so many of us march in our capital and across the nation, we want to call attention to all those who can't and remind Congress that part of why we march is because [gun violence victims] can't", Soria told NBC Washington last week.
Donors to the shoe monument include actresses Susan Sarandon and Bette Midler and talk show host Chelsea Handler. The boots were donated by the parents of Allison Parker, a 24-year-old reporter who was fatally shot on live television in 2015.
Tom Mauser came wearing the same shoes his son wore the day he died. Avaaz then tallied up the estimated number since the December 2012 shooting at Sandy Hook Elementary School. The figure used by Avaaz would amount to approximately 6,825 children killed by guns in that time period.
According to CNN, Avaaz took the 7,000 figure from a 2017 American Academy of Pediatrics report which claimed that nearly 1,300 children die from gunshot wounds in the USA every year.
The display feature 7,000 pairs of shoes.
The Florida incident was the 17th school shooting in 2018 alone, and has sparked tensions between the National Rifle Association, the surviving students, and Democrats and Republicans both in state houses and the White House.