The first time I saw Rajesh sloshing in the mud, his face was lit up with joy. He was building his future home at Sristi, in Thazhuthali village in the southern Indian state of Tamil Nadu. A few months later, the 160-square-foot handcrafted house was ready, built completely by the men at Sristi — a nonprofit organization that helps intellectually challenged people lead self-reliant lives — using local materials.