Between 11 November and 2 February the sun disappears in Viganella, an Italian Alpine village, that was built at the bottom of a steep valley. Three months the inhabitants of Viganella have to live without solar irradiation.
From now on Viganella is maybe the first and only village equipped with a heliostat. A motorised mirror (about 5m width) tracks the sun and reflects it to the main square of Viganella: the first winter sun ever in the village's 800 years of existence.