This is a video, directed by Skip Shea, using the children's shoes that were donated for an exhibit called "Putting On Its Shoes" taken from the Mark Twain quote - "A lie can travel halfway around the world while the truth is still putting on its shoes."
I've collected 180 children's shoe, each one representing 6,666 children who were victims of clergy sexual abuse totaling an estimated 1,200,000 victims worldwide. The estimates come from extrapolating and averaging numbers complied by Fr Andrew Greeley and Bishops Accountability.
Ave Maria is sung by Alessandro Moreschi, the last famous castrito who sang in the choir at the bascillica in Rome. He was castrated when he was a little boy so he could sing like that for the Pope.