Tsarin Alfarwa Na Hotochromic Or2 tsari ne na rufin gida daya wanda ya danganci hasken rana. Abubuwan da ke cikin polygonal na farfajiya suna amsawa ga hasken fitila, suna taskance matsayi da tsananin hasken rana. Lokacin da yake cikin inuwa, ɓangarorin Or2 sun kasance fari fari. Koyaya lokacin da hasken rana ya buge su sai su zama masu launin, ambaliyawar sararin samaniya a ƙasa da launuka daban-daban na haske. Yayin rana Or2 ya zama na'urar shading wanda yake sarrafa sararin da ke ƙasa da shi. A dare Or2 yana canzawa zuwa babban chandelier, watsa haske wanda aka tattara ta hanyar haɗin selvoltaic da rana.
