Follow the truck
The waste pickers were assisted by a big bulldozer. Starting at the top of the hill, it shoved the waste towards the sides, leaving a trail of reshuffled waste. Consequently, a lot of valuable hidden material ended up on top again, attracting all the waste pickers. Sometimes one of the waste pickers asked the driver to shove the waste at particular places where the picker expected to be a lot of recyclable pieces of waste.