Famed for enormous black-and-white portraits that are pasted on surfaces ranging from the Louvre to the US-Mexico border wall, multimedia artist JR continues to tackle ambitious projects. In this powerfully moving talk, he shares how he made a giant mural on the courtyard floor of a maximum-security prison -- with the help of guards and prisoners alike -- and ended up with much more than a compelling image.

 JR: Why art is a tool for hope

Why art is a tool for hope

Art transcends walls: A maximum-security prison's courtyard becomes a canvas, uniting inmates and guards in unexpected camaraderie.

A transformative mural in a prison ignites hope, changing how inmates are seen by themselves, their families, and even the guards.

Art's power to rehabilitate: A man removes a hate symbol tattoo with help from a Jewish doctor, symbolizing personal redemption.