This year, construction of a new highway to China has begun in their roadless valley, and things are never going to be the same. Mechanical diggers gouge chunks out of the hillside while the locals look on, concerned about the fate of an elderly neighbour’s potato plot. The inevitable collision between progress and tradition dominates the film. It's beautifully observational, catching wonderful details of daily life along with the sparky personalities of the people on screen as they make their annual migration.