Peruvian brickmaker Ernesto has perfected a strategy for stacking heavy, dull red bricks in this open-air brickworks outside Lima. But he can't share the tricks of his trade because he is only three years old and can barely talk. "I'm tired," said the small, dark-haired boy. Nevertheless, he and his seven-year-old sister Maribel begin their task: turning over sand and water bricks with their feet so they dry in the sun in the informal brickyard. Some 500 other children work near Ernesto and Maribel at the brickworks, where they breathe thick dust all day as they labour to help their poor families.